PATENT DOCUMENT

Publication Number: US-10235014-B2
Application Number: US-201514830629-A
Country: US
Kind Code: B2

Title: Music user interface

Abstract:
The present disclosure relates to music user interfaces. A device, including a display and a rotatable input mechanism, is described in relation to accessing and playing music. In some examples, a user can provide input through the rotatable input mechanism to access a landing screen of a music application. The landing screen concurrently displays an affordance for accessing playlists, an affordance for a list of artists, and an affordance for accessing a list of songs.

Claims:
What is claimed is: 
     
       1. A non-transitory computer-readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by one or more processors of an electronic device comprising a display and a rotatable input mechanism, cause the device to:
 display, on the display, a plurality of application affordances, including an affordance representing a music application; 
 while the affordance representing the music application is displayed substantially at the center of the display, receive user input representing movement of the rotatable input mechanism; 
 in response to receiving the user input representing the movement of the rotatable input mechanism, display a landing screen of the music application, wherein the landing screen includes display of a playlist affordance, an artist list affordance, and a song list affordance; 
 receive user input associated with the landing screen; 
 determine whether the user input associated with the landing screen represents a touch associated with the playlist affordance, the artist list affordance, or the song list affordance; 
 in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the playlist affordance, display, on the display, one or more playlist selection affordances; 
 in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the artist list affordance, display, on the display, one or more artist selection affordances; and 
 in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the song list affordance, display, on the display, one or more song selection affordances. 
 
     
     
       2. The non-transitory computer-readable storage medium of  claim 1 , wherein the electronic device includes a touch-sensitive surface configured to detect intensity of touches, and wherein the non-transitory computer-readable storage medium further comprises instructions, which when executed by the one or more processors of the electronic device, cause the device to:
 while displaying the one or more playlist selection affordances, receive user input representing a touch on a playlist selection affordance of the one or more playlist selection affordances; 
 determine whether a characteristic intensity of the touch on the playlist selection affordance exceeds an intensity threshold; 
 in accordance with a determination that the characteristic intensity of the touch on the playlist selection affordance exceeds the intensity threshold, display, on the display, a first set of affordances; and 
 in accordance with a determination that the characteristic intensity of the touch on the playlist selection affordance does not exceed the intensity threshold, display, on the display, one or more song selection affordances of a playlist associated with the playlist selection affordance. 
 
     
     
       3. The non-transitory computer-readable storage medium of  claim 2 , wherein the first set of affordances includes a source affordance. 
     
     
       4. The non-transitory computer-readable storage medium of  claim 2 , wherein the non-transitory computer-readable storage medium further comprises instructions, which when executed by the one or more processors of the electronic device, cause the device to:
 while displaying the one or more song selection affordances of the playlist, receive user input representing a touch on a song selection affordance of the one or more song selection affordances of the playlist; 
 determine whether a characteristic intensity of the touch on the song selection affordance exceeds an intensity threshold; 
 in accordance with a determination that the characteristic intensity of the touch on the song selection affordance exceeds the intensity threshold, display, on the display, a second set of affordances; and 
 in accordance with a determination that the characteristic intensity of the touch on the song selection affordance does not exceed the intensity threshold;
 display, on the display, an audio playback user interface; and 
 start audio playback of an audio file associated with the song selection affordance. 
 
 
     
     
       5. The non-transitory computer-readable storage medium of  claim 1 , wherein the electronic device includes a touch-sensitive surface configured to detect intensity of touches, and wherein the non-transitory computer-readable storage medium further comprises instructions, which when executed by the one or more processors of the electronic device, cause the device to:
 while displaying the one or more artist selection affordances, receive user input representing a touch on an artist selection affordance of the one or more artist selection affordances; 
 determine whether a characteristic intensity of the touch on the artist selection affordance exceeds an intensity threshold; 
 in accordance with a determination that the characteristic intensity of the touch on the artist selection affordance exceeds the intensity threshold, display, on the display, a third set of affordances; and 
 in accordance with a determination that the characteristic intensity of the touch on the artist selection affordance does not exceed the intensity threshold, display, on the display, one or more album selection affordances of an artist associated with the artist selection affordance. 
 
     
     
       6. The non-transitory computer-readable storage medium of  claim 5 , wherein the third set of affordances includes a source affordance. 
     
     
       7. The non-transitory computer-readable storage medium of  claim 5 , wherein the non-transitory computer-readable storage medium further comprises instructions, which when executed by the one or more processors of the electronic device, cause the device to:
 while displaying the one or more album selection affordances of the artist, receive user input representing a touch on an album selection affordance of the one or more album selection affordances of the artist; 
 determine whether a characteristic intensity of the touch on the album selection affordance exceeds an intensity threshold; 
 in accordance with a determination that the characteristic intensity of the touch on the album selection affordance exceeds the intensity threshold, display, on the display, a fourth set of affordances; and 
 in accordance with a determination that the characteristic intensity of the touch on the album selection affordance does not exceed the intensity threshold, display, on the display, one or more song selection affordances of an album associated with the album selection affordance. 
 
     
     
       8. The non-transitory computer-readable storage medium of  claim 1 , wherein the electronic device includes a touch-sensitive surface configured to detect intensity of touches, and wherein the non-transitory computer-readable storage medium further comprises instructions, which when executed by the one or more processors of the electronic device, cause the device to:
 while displaying the one or more song selection affordances, receive user input representing a touch on a song selection affordance of the one or more song selection affordances; 
 determine whether a characteristic intensity of the touch on the song selection affordance exceeds an intensity threshold; 
 in accordance with a determination that the characteristic intensity of the touch on the song selection affordance exceeds the intensity threshold, display, on the display, a fifth set of affordances; and 
 in accordance with a determination that the characteristic intensity of the touch on the song selection affordance does not exceed the intensity threshold;
 display, on the display, an audio playback user interface; and 
 start audio playback of an audio file associated with the song selection affordance. 
 
 
     
     
       9. The non-transitory computer-readable storage medium of  claim 8 , wherein the fifth set of affordances includes one or more of a shuffle affordance and a source affordance. 
     
     
       10. The non-transitory computer-readable storage medium of  claim 1 , wherein the non-transitory computer-readable storage medium further comprises instructions, which when executed by the one or more processors of the electronic device, cause the device to:
 while displaying an audio playback user interface, receive user input representing a touch on the audio playback user interface; 
 determine whether a characteristic intensity of the touch on the audio playback user interface exceeds an intensity threshold; and 
 in accordance with a determination that the characteristic intensity of the touch on the audio playback user interface exceeds the intensity threshold, display, on the display, a sixth set of affordances. 
 
     
     
       11. The non-transitory computer-readable storage medium of  claim 10 , wherein the sixth set of affordances includes one or more of a shuffle affordance, a repeat affordance, and a source affordance. 
     
     
       12. The non-transitory computer-readable storage medium of  claim 1 , wherein the non-transitory computer-readable storage medium further comprises instructions, which when executed by the one or more processors of the electronic device, cause the device to:
 receive user input; 
 in response to receiving the user input, display, on the display, the affordance representing the music application; 
 determine whether the music application is currently playing an audio file; 
 in accordance with a determination that the music application is currently playing an audio file, display an affordance representing an audio playback user interface; 
 receive user input representing a touch on the affordance representing the audio playback user interface; and 
 in response to receiving the user input representing the touch on the affordance representing the audio playback user interface, display, on the display, the audio playback user interface. 
 
     
     
       13. The non-transitory computer-readable storage medium of  claim 1 , wherein the non-transitory computer-readable storage medium further comprises instructions, which when executed by the one or more processors of the electronic device, cause the device to:
 receive user input; 
 in response to receiving the user input, display, a user interface for an application, wherein the application and the music application are different applications; 
 determine whether the music application is currently playing an audio file; and 
 in accordance with a determination that the music application is currently playing an audio file, display an affordance representing an audio playback user interface, wherein the affordance representing the audio playback user interface and the user interface for the application are displayed concurrently. 
 
     
     
       14. The non-transitory computer-readable storage medium of  claim 13 , wherein the non-transitory computer-readable storage medium further comprises instructions, which when executed by the one or more processors of the electronic device, cause the device to:
 receive user input representing a touch on the affordance representing the audio playback user interface; and 
 in response to receiving the user input representing the touch on the affordance representing the audio playback user interface, replace display of the user interface for the application with display of a user interface for the music application. 
 
     
     
       15. The non-transitory computer-readable storage medium of  claim 14 , wherein the user interface for the music application comprises the audio playback user interface. 
     
     
       16. The non-transitory computer-readable storage medium of  claim 12 , wherein the non-transitory computer-readable storage medium further comprises instructions, which when executed by the one or more processors of the electronic device, cause the device to:
 determine whether a phone call is currently active, the currently active phone call associated with a phone application; 
 in accordance with a determination that a phone call is currently active, display an affordance representing the phone application, wherein the affordance representing the phone application and the affordance representing the audio playback user interface are displayed concurrently; 
 receive user input representing a touch on the affordance representing the phone application; and 
 in response to receiving the user input representing the touch on the affordance representing the phone application, display, on the display, a user interface of the phone application. 
 
     
     
       17. The non-transitory computer-readable storage medium of  claim 1 , wherein a song selection affordance of the one or more song selection affordances includes an indication of being stored locally on the electronic device. 
     
     
       18. The non-transitory computer-readable storage medium of  claim 1 , wherein a song selection affordance of the one or more song selection affordances includes an indication of not being stored locally on the electronic device. 
     
     
       19. The non-transitory computer-readable storage medium of  claim 1 , wherein a song selection affordance of the one or more song selection affordances includes an indication of being stored on an external electronic device. 
     
     
       20. A method, comprising:
 at an electronic device with a display and a rotatable input mechanism:
 displaying, on the display, a plurality of application affordances, including an affordance representing a music application; 
 while the affordance representing the music application is displayed substantially at the center of the display, receiving user input representing movement of the rotatable input mechanism; 
 in response to receiving the user input representing the movement of the rotatable input mechanism, displaying a landing screen of the music application, wherein the landing screen includes display of a playlist affordance, an artist list affordance, and a song list affordance; 
 receiving user input associated with the landing screen; 
 determining whether the user input associated with the landing screen represents a touch associated with the playlist affordance, the artist list affordance, or the song list affordance; 
 in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the playlist affordance, displaying, on the display, one or more playlist selection affordances; 
 in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the artist list affordance, displaying, on the display, one or more artist selection affordances; and 
 in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the song list affordance, displaying, on the display, one or more song selection affordances. 
 
 
     
     
       21. An electronic device, comprising:
 a display; 
 a rotatable input mechanism; 
 one or more processors; 
 memory; and 
 one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for:
 displaying, on the display, a plurality of application affordances, including an affordance representing a music application; 
 while the affordance representing the music application is displayed substantially at the center of the display, receiving user input representing movement of the rotatable input mechanism; 
 in response to receiving the user input representing the movement of the rotatable input mechanism, displaying a landing screen of the music application, wherein the landing screen includes display of a playlist affordance, an artist list affordance, and a song list affordance; 
 receiving user input associated with the landing screen; 
 determining whether the user input associated with the landing screen represents a touch associated with the playlist affordance, the artist list affordance, or the song list affordance; 
 in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the playlist affordance, displaying, on the display, one or more playlist selection affordances; 
 in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the artist list affordance, displaying, on the display, one or more artist selection affordances; and 
 in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the song list affordance, displaying, on the display, one or more song selection affordances. 
 
 
     
     
       22. The non-transitory computer-readable storage medium of  claim 1 , wherein the affordance representing the music application, while displayed substantially at the center of the display, is displayed at a size that is larger than the displayed size of the other application affordances of the plurality of affordances. 
     
     
       23. The method of  claim 20 , further comprising:
 while displaying the one or more playlist selection affordances, receiving user input representing a touch on a playlist selection affordance of the one or more playlist selection affordances; 
 determining whether a characteristic intensity of the touch on the playlist selection affordance exceeds an intensity threshold; 
 in accordance with a determination that the characteristic intensity of the touch on the playlist selection affordance exceeds the intensity threshold, displaying, on the display, a first set of affordances; and 
 in accordance with a determination that the characteristic intensity of the touch on the playlist selection affordance does not exceed the intensity threshold, displaying, on the display, one or more song selection affordances of a playlist associated with the playlist selection affordance. 
 
     
     
       24. The method of  claim 23 , wherein the first set of affordances includes a source affordance. 
     
     
       25. The method of  claim 23 , further comprising:
 while displaying the one or more song selection affordances of the playlist, receiving user input representing a touch on a song selection affordance of the one or more song selection affordances of the playlist; 
 determining whether a characteristic intensity of the touch on the song selection affordance exceeds an intensity threshold; 
 in accordance with a determination that the characteristic intensity of the touch on the song selection affordance exceeds the intensity threshold, displaying, on the display, a second set of affordances; and 
 in accordance with a determination that the characteristic intensity of the touch on the song selection affordance does not exceed the intensity threshold:
 displaying, on the display, an audio playback user interface; and 
 starting audio playback of an audio file associated with the song selection affordance. 
 
 
     
     
       26. The method of  claim 20 , further comprising:
 while displaying the one or more artist selection affordances, receiving user input representing a touch on an artist selection affordance of the one or more artist selection affordances; 
 determining whether a characteristic intensity of the touch on the artist selection affordance exceeds an intensity threshold; 
 in accordance with a determination that the characteristic intensity of the touch on the artist selection affordance exceeds the intensity threshold, displaying, on the display, a third set of affordances; and 
 in accordance with a determination that the characteristic intensity of the touch on the artist selection affordance does not exceed the intensity threshold, displaying, on the display, one or more album selection affordances of an artist associated with the artist selection affordance. 
 
     
     
       27. The method of  claim 26 , wherein the third set of affordances includes a source affordance. 
     
     
       28. The method of  claim 26 , further comprising:
 while displaying the one or more album selection affordances of the artist, receiving user input representing a touch on an album selection affordance of the one or more album selection affordances of the artist; 
 determining whether a characteristic intensity of the touch on the album selection affordance exceeds an intensity threshold; 
 in accordance with a determination that the characteristic intensity of the touch on the album selection affordance exceeds the intensity threshold, displaying, on the display, a fourth set of affordances; and 
 in accordance with a determination that the characteristic intensity of the touch on the album selection affordance does not exceed the intensity threshold, displaying, on the display, one or more song selection affordances of an album associated with the album selection affordance. 
 
     
     
       29. The method of  claim 20 , further comprising:
 while displaying the one or more song selection affordances, receiving user input representing a touch on a song selection affordance of the one or more song selection affordances; 
 determining whether a characteristic intensity of the touch on the song selection affordance exceeds an intensity threshold; 
 in accordance with a determination that the characteristic intensity of the touch on the song selection affordance exceeds the intensity threshold, displaying, on the display, a fifth set of affordances; and 
 in accordance with a determination that the characteristic intensity of the touch on the song selection affordance does not exceed the intensity threshold:
 displaying, on the display, an audio playback user interface; and 
 starting audio playback of an audio file associated with the song selection affordance. 
 
 
     
     
       30. The method of  claim 29 , wherein the fifth set of affordances includes one or more of a shuffle affordance and a source affordance. 
     
     
       31. The method of  claim 20 , further comprising:
 while displaying an audio playback user interface, receiving user input representing a touch on the audio playback user interface; 
 determining whether a characteristic intensity of the touch on the audio playback user interface exceeds an intensity threshold; and 
 in accordance with a determination that the characteristic intensity of the touch on the audio playback user interface exceeds the intensity threshold, displaying, on the display, a sixth set of affordances. 
 
     
     
       32. The method of  claim 31 , wherein the sixth set of affordances includes one or more of a shuffle affordance, a repeat affordance, and a source affordance. 
     
     
       33. The method of  claim 20 , further comprising:
 receiving user input; 
 in response to receiving the user input, displaying, on the display, the affordance representing the music application; 
 determining whether the music application is currently playing an audio file; 
 in accordance with a determination that the music application is currently playing an audio file, displaying an affordance representing an audio playback user interface; 
 receiving user input representing a touch on the affordance representing the audio playback user interface; and 
 in response to receiving the user input representing the touch on the affordance representing the audio playback user interface, displaying, on the display, the audio playback user interface. 
 
     
     
       34. The method of  claim 20 , further comprising:
 receiving user input; 
 in response to receiving the user input, display, a user interface for an application, wherein the application and the music application are different applications; 
 determining whether the music application is currently playing an audio file; and 
 in accordance with a determination that the music application is currently playing an audio file, displaying an affordance representing an audio playback user interface, wherein the affordance representing the audio playback user interface and the user interface for the application are displayed concurrently. 
 
     
     
       35. The method of  claim 34 , further comparing:
 receiving user input representing a touch on the affordance representing the audio playback user interface; and 
 in response to receiving the user input representing the touch on the affordance representing the audio playback user interface, replacing display of the user interface for the application with display of a user interface for the music application. 
 
     
     
       36. The method of  claim 35 , wherein the user interface for the music application comprises the audio playback user interface. 
     
     
       37. The method of  claim 33 , further comprising:
 determining whether a phone call is currently active, the currently active phone call associated with a phone application; 
 in accordance with a determination that a phone call is currently active, displaying an affordance representing the phone application, wherein the affordance representing the phone application and the affordance representing the audio playback user interface are displayed concurrently; 
 receiving user input representing a touch on the affordance representing the phone application; and 
 in response to receiving the user input representing the touch on the affordance representing the phone application, displaying, on the display, a user interface of the phone application. 
 
     
     
       38. The method of  claim 20 , wherein a song selection affordance of the one or more song selection affordances includes an indication of being stored locally on the electronic device. 
     
     
       39. The method of  claim 20 , wherein a song selection affordance of the one or more song selection affordances includes an indication of not being stored locally on the electronic device. 
     
     
       40. The method of  claim 20 , wherein a song selection affordance of the one or more song selection affordances includes an indication of being stored on an external electronic device. 
     
     
       41. The method of  claim 20 , wherein the affordance representing the music application, while displayed substantially at the center of the display, is displayed at a size that is larger than the displayed size of the other application affordances of the plurality of affordances. 
     
     
       42. The electronic device of  claim 21 , the one or more programs further including instructions for:
 while displaying the one or more playlist selection affordances, receiving user input representing a touch on a playlist selection affordance of the one or more playlist selection affordances; 
 determining whether a characteristic intensity of the touch on the playlist selection affordance exceeds an intensity threshold; 
 in accordance with a determination that the characteristic intensity of the touch on the playlist selection affordance exceeds the intensity threshold, displaying, on the display, a first set of affordances; and 
 in accordance with a determination that the characteristic intensity of the touch on the playlist selection affordance does not exceed the intensity threshold, displaying, on the display, one or more song selection affordances of a playlist associated with the playlist selection affordance. 
 
     
     
       43. The electronic device of  claim 42 , wherein the first set of affordances includes a source affordance. 
     
     
       44. The electronic device of  claim 42 , the one or more programs further including instructions for:
 while displaying the one or more song selection affordances of the playlist, receiving user input representing a touch on a song selection affordance of the one or more song selection affordances of the playlist; 
 determining whether a characteristic intensity of the touch on the song selection affordance exceeds an intensity threshold; 
 in accordance with a determination that the characteristic intensity of the touch on the song selection affordance exceeds the intensity threshold, displaying, on the display, a second set of affordances; and 
 in accordance with a determination that the characteristic intensity of the touch on the song selection affordance does not exceed the intensity threshold:
 displaying, on the display, an audio playback user interface; and 
 starting audio playback of an audio file associated with the song selection affordance. 
 
 
     
     
       45. The electronic device of  claim 21 , the one or more programs further including instructions for:
 while displaying the one or more artist selection affordances, receiving user input representing a touch on an artist selection affordance of the one or more artist selection affordances;
 determining whether a characteristic intensity of the touch on the artist selection affordance exceeds an intensity threshold; 
 in accordance with a determination that the characteristic intensity of the touch on the artist selection affordance exceeds the intensity threshold, displaying, on the display, a third set of affordances; and 
 in accordance with a determination that the characteristic intensity of the touch on the artist selection affordance does not exceed the intensity threshold, displaying, on the display, one or more album selection affordances of an artist associated with the artist selection affordance. 
 
 
     
     
       46. The electronic device of  claim 45 , wherein the third set of affordances includes a source affordance. 
     
     
       47. The electronic device of  claim 45 , the one or more programs further including instructions for:
 while displaying the one or more album selection affordances of the artist, receiving user input representing a touch on an album selection affordance of the one or more album selection affordances of the artist; 
 determining whether a characteristic intensity of the touch on the album selection affordance exceeds an intensity threshold; 
 in accordance with a determination that the characteristic intensity of the touch on the album selection affordance exceeds the intensity threshold, displaying, on the display, a fourth set of affordances; and 
 in accordance with a determination that the characteristic intensity of the touch on the album selection affordance does not exceed the intensity threshold, displaying, on the display, one or more song selection affordances of an album associated with the album selection affordance. 
 
     
     
       48. The electronic device of  claim 21 , the one or more programs further including instructions for:
 while displaying the one or more song selection affordances, receiving user input representing a touch on a song selection affordance of the one or more song selection affordances; 
 determining whether a characteristic intensity of the touch on the song selection affordance exceeds an intensity threshold; 
 in accordance with a determination that the characteristic intensity of the touch on the song selection affordance exceeds the intensity threshold, displaying, on the display, a fifth set of affordances; and 
 in accordance with a determination that the characteristic intensity of the touch on the song selection affordance does not exceed the intensity threshold:
 displaying, on the display, an audio playback user interface; and 
 starting audio playback of an audio file associated with the song selection affordance. 
 
 
     
     
       49. The electronic device of  claim 48 , wherein the fifth set of affordances includes one or more of a shuffle affordance and a source affordance. 
     
     
       50. The electronic device of  claim 21 , the one or more programs further including instructions for:
 while displaying an audio playback user interface, receiving user input representing a touch on the audio playback user interface; 
 determining whether a characteristic intensity of the touch on the audio playback user interface exceeds an intensity threshold; and 
 in accordance with a determination that the characteristic intensity of the touch on the audio playback user interface exceeds the intensity threshold, displaying, on the display, a sixth set of affordances. 
 
     
     
       51. The electronic device of  claim 50 , wherein the sixth set of affordances includes one or more of a shuffle affordance, a repeat affordance, and a source affordance. 
     
     
       52. The electronic device of  claim 21 , the one or more programs further including instructions for:
 receiving user input; 
 in response to receiving the user input, displaying, on the display, the affordance representing the music application; 
 determining whether the music application is currently playing an audio file; 
 in accordance with a determination that the music application is currently playing an audio file, displaying an affordance representing an audio playback user interface; 
 receiving user input representing a touch on the affordance representing the audio playback user interface; and 
 in response to receiving the user input representing the touch on the affordance representing the audio playback user interface, displaying, on the display, the audio playback user interface. 
 
     
     
       53. The electronic device of  claim 21 , the one or more programs further including instructions for:
 receiving user input; 
 in response to receiving the user input, display, a user interface for an application, wherein the application and the music application are different applications; 
 determining whether the music application is currently playing an audio file; and 
 in accordance with a determination that the music application is currently playing an audio file, displaying an affordance representing an audio playback user interface, wherein the affordance representing the audio playback user interface and the user interface for the application are displayed concurrently. 
 
     
     
       54. The electronic device of  claim 53 , further comparing:
 receiving user input representing a touch on the affordance representing the audio playback user interface; and 
 in response to receiving the user input representing the touch on the affordance representing the audio playback user interface, replacing display of the user interface for the application with display of a user interface for the music application. 
 
     
     
       55. The electronic device of  claim 54 , wherein the user interface for the music application comprises the audio playback user interface. 
     
     
       56. The electronic device of  claim 52 , the one or more programs further including instructions for:
 determining whether a phone call is currently active, the currently active phone call associated with a phone application; 
 in accordance with a determination that a phone call is currently active, displaying an affordance representing the phone application, wherein the affordance representing the phone application and the affordance representing the audio playback user interface are displayed concurrently; 
 receiving user input representing a touch on the affordance representing the phone application; and 
 in response to receiving the user input representing the touch on the affordance representing the phone application, displaying, on the display, a user interface of the phone application. 
 
     
     
       57. The electronic device of  claim 21 , wherein a song selection affordance of the one or more song selection affordances includes an indication of being stored locally on the electronic device. 
     
     
       58. The electronic device of  claim 21 , wherein a song selection affordance of the one or more song selection affordances includes an indication of not being stored locally on the electronic device. 
     
     
       59. The electronic device of  claim 21 , wherein a song selection affordance of the one or more song selection affordances includes an indication of being stored on an external electronic device. 
     
     
       60. The electronic device of  claim 21 , wherein the affordance representing the music application, while displayed substantially at the center of the display, is displayed at a size that is larger than the displayed size of the other application affordances of the plurality of affordances.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to U.S. Provisional Patent Application Ser. No. 62/044,952, entitled “MUSIC USER INTERFACE,” filed Sep. 2, 2014, and U.S. Provisional Patent Application Ser. No. 62/129,940, entitled “MUSIC USER INTERFACE,” filed Mar. 8, 2015, the content of each of which is hereby incorporated by reference in their entirety for all purposes. 
     This application also relates to the following applications: International Patent Application Serial No. PCT/US2013/040087, entitled “Device, Method, and Graphical User Interface for Moving a User Interface Object Based on an Intensity of a Press Input,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040072, entitled “Device, Method, and Graphical User Interface for Providing Feedback for Changing Activation States of a User Interface Object,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040070, entitled “Device, Method, and Graphical User Interface for Providing Tactile Feedback for Operations Performed in a User Interface,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040067, entitled “Device, Method, and Graphical User Interface for Facilitating User Interaction with Controls in a User Interface,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040061, entitled “Device, Method, and Graphical User Interface for Displaying User Interface Objects Corresponding to an Application,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040058, entitled “Device, Method, and Graphical User Interface for Displaying Additional Information in Response to a User Contact,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040056, entitled “Device, Method, and Graphical User Interface for Scrolling Nested Regions,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040054, entitled “Device, Method, and Graphical User Interface for Manipulating Framed Graphical Objects,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/069489, entitled “Device, Method, and Graphical User Interface for Switching Between User Interfaces,” filed Nov. 11, 2013; International Patent Application Serial No. PCT/US2013/069486, entitled “Device, Method, and Graphical User Interface for Determining Whether to Scroll or Select Content,” filed Nov. 11, 2013; International Patent Application Serial No. PCT/US2013/069484, entitled “Device, Method, and Graphical User Interface for Moving a Cursor According to a Change in an Appearance of a Control Icon with Simulated Three-Dimensional Characteristics,” filed Nov. 11, 2013; International Patent Application Serial No. PCT/US2013/069483, entitled “Device, Method, and Graphical User Interface for Transitioning Between Touch Input to Display Output Relationships,” filed Nov. 11, 2013; International Patent Application Serial No. PCT/US2013/069479, entitled “Device, Method, and Graphical User Interface for Forgoing Generation of Tactile Output for a Multi-Contact Gesture,” filed Nov. 11, 2013; International Patent Application Serial No. PCT/US2013/069472, entitled “Device, Method, and Graphical User Interface for Navigating User Interface Hierarchies,” filed Nov. 11, 2013; International Patent Application Serial No. PCT/US2013/040108, entitled “Device, Method, and Graphical User Interface for Moving and Dropping a User Interface Object,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040101, entitled “Device, Method, and Graphical User Interface for Selecting User Interface Objects,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040098, entitled “Device, Method, and Graphical User Interface for Displaying Content Associated with a Corresponding Affordance,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040093, entitled “Device, Method, and Graphical User Interface for Transitioning Between Display States in Response to a Gesture,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040053, entitled “Device, Method, and Graphical User Interface for Selecting Object within a Group of Objects,” filed May 8, 2013; U.S. Patent Application Ser. No. 61/778,211, entitled “Device, Method, and Graphical User Interface for Facilitating User Interaction with Controls in a User Interface,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,191, entitled “Device, Method, and Graphical User Interface for Displaying User Interface Objects Corresponding to an Application,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,171, entitled “Device, Method, and Graphical User Interface for Displaying Additional Information in Response to a User Contact,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,179, entitled “Device, Method and Graphical User Interface for Scrolling Nested Regions,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,156, entitled “Device, Method, and Graphical User Interface for Manipulating Framed Graphical Objects,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,125, entitled “Device, Method, And Graphical User Interface for Navigating User Interface Hierarchies,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,092, entitled “Device, Method, and Graphical User Interface for Selecting Object Within a Group of Objects,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,418, entitled “Device, Method, and Graphical User Interface for Switching Between User Interfaces,” filed Mar. 13, 2013; U.S. Patent Application Ser. No. 61/778,416, entitled “Device, Method, and Graphical User Interface for Determining Whether to Scroll or Select Content,” filed Mar. 13, 2013; U.S. Patent Application Ser. No. 61/747,278, entitled “Device, Method, and Graphical User Interface for Manipulating User Interface Objects with Visual and/or Haptic Feedback,” filed Dec. 29, 2012; U.S. Patent Application Ser. No. 61/778,414, entitled “Device, Method, and Graphical User Interface for Moving and Dropping a User Interface Object,” filed Mar. 13, 2013; U.S. Patent Application Ser. No. 61/778,413, entitled “Device, Method, and Graphical User Interface for Selecting User Interface Objects,” filed Mar. 13, 2013; U.S. Patent Application Ser. No. 61/778,412, entitled “Device, Method, and Graphical User Interface for Displaying Content Associated with a Corresponding Affordance,” filed Mar. 13, 2013; U.S. Patent Application Ser. No. 61/778,373, entitled “Device, Method, and Graphical User Interface for Managing Activation of a Control Based on Contact Intensity,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,265, entitled “Device, Method, and Graphical User Interface for Transitioning Between Display States in Response to a Gesture,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,367, entitled “Device, Method, and Graphical User Interface for Moving a User Interface Object Based on an Intensity of a Press Input,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,363, entitled “Device, Method, and Graphical User Interface for Transitioning Between Touch Input to Display Output Relationships,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,287, entitled “Device, Method, and Graphical User Interface for Providing Feedback for Changing Activation States of a User Interface Object,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,284, entitled “Device, Method, and Graphical User Interface for Providing Tactile Feedback for Operations Performed in a User Interface,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,239, entitled “Device, Method, and Graphical User Interface for Forgoing Generation of Tactile Output for a Multi-Contact Gesture,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/688,227, entitled “Device, Method, and Graphical User Interface for Manipulating User Interface Objects with Visual and/or Haptic Feedback,” filed May 9, 2012; U.S. Provisional Patent Application Ser. No. 61/645,033, filed on May 9, 2012, entitled “Adaptive Haptic Feedback for Electronic Devices;” U.S. Provisional Patent Application Ser. No. 61/665,603, filed on Jun. 28, 2012, entitled “Adaptive Haptic Feedback for Electronic Devices;” and U.S. Provisional Patent Application Ser. No. 61/681,098, filed on Aug. 8, 2012, entitled “Adaptive Haptic Feedback for Electronic Devices.” The content of these applications is hereby incorporated by reference in their entirety. 
    
    
     FIELD 
     The present disclosure relates generally to computer user interfaces, and more specifically to techniques for accessing and playing music content. 
     BACKGROUND 
     The use of electronic devices for accessing and playing music content (e.g., audio files, MPEG3 files, and AAC files) has significantly increased in recent years. Music content typically includes metadata, which identifies the title, artist(s), genre, and album of the music. Users can organize music into playlists. Devices provide a user interface to the user for accessing the music, such as for playback selection. 
     BRIEF SUMMARY 
     Some techniques for accessing and playing music using electronic devices, however, are generally cumbersome and inefficient. For example, accessing music for playback may require navigating a complex and time-consuming user interface, which may include multiple key presses or keystrokes. Existing techniques require more time than necessary, wasting user time and device energy. This latter consideration is particularly important in battery-operated devices. 
     Accordingly, there is a need for electronic devices with faster, more efficient methods and interfaces for accessing and playing music. Such methods and interfaces optionally complement or replace conventional methods for accessing and playing music. Such methods and interfaces reduce the cognitive burden on a user and produce a more efficient human-machine interface. For battery-operated computing devices, such methods and interfaces conserve power and increase the time between battery charges. 
     The above deficiencies and other problems associated with user interfaces for computing devices for accessing and playing music are reduced or eliminated by the disclosed devices. In some embodiments, the device is a desktop computer. In some embodiments, the device is portable (e.g., a notebook computer, tablet computer, or handheld device). In some embodiments, the device has a touchpad. In some embodiments, the device is user-wearable. In some embodiments, the device has a touch-sensitive display (also known as a “touch screen” or “touch screen display”). In some embodiments, the device has a display and a touch-sensitive surface. In some embodiments, the device has a short-range communication radio. In some embodiments, the device has a graphical user interface (GUI), one or more processors, memory and one or more modules, programs or sets of instructions stored in the memory for performing multiple functions. In some embodiments, the user interacts with the GUI primarily through finger contacts and gestures on the touch-sensitive surface. Executable instructions for performing these functions may be included in a computer-readable storage medium or other computer program product configured for execution by one or more processors. 
     In some embodiments, a method is performed at an electronic device with a display and a rotatable input mechanism. The method comprises: displaying, on the display, an affordance representing a music application; receiving user input representing movement of the rotatable input mechanism; in response to receiving the user input representing the movement of the rotatable input mechanism, displaying a landing screen of the music application, wherein the landing screen includes display of a playlist affordance, an artist list affordance, and a song list affordance; receiving user input associated with the landing screen; determining whether the user input associated with the landing screen represents a touch associated with the playlist affordance, the artist list affordance, or the song list affordance; in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the playlist affordance, displaying, on the display, one or more playlist selection affordances; in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the artist list affordance, displaying, on the display, one or more artist selection affordances; and in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the song list affordance, displaying, on the display, one or more song selection affordances. 
     In some embodiments, a non-transitory computer-readable storage medium stores one or more programs, the one or more programs comprising instructions, which when executed by an electronic device with a display and a rotatable input mechanism cause the device to: display, on the display, an affordance representing a music application; receive user input representing movement of the rotatable input mechanism; in response to receiving the user input representing the movement of the rotatable input mechanism, display a landing screen of the music application, wherein the landing screen includes display of a playlist affordance, an artist list affordance, and a song list affordance; receive user input associated with the landing screen; determine whether the user input associated with the landing screen represents a touch associated with the playlist affordance, the artist list affordance, or the song list affordance; in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the playlist affordance, display, on the display, one or more playlist selection affordances; in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the artist list affordance, display, on the display, one or more artist selection affordances; and in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the song list affordance, display, on the display, one or more song selection affordances. 
     In some embodiments, an electronic device comprises: a display; a rotatable input mechanism; one or more processors; memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for: displaying, on the display, an affordance representing a music application; receiving user input representing movement of the rotatable input mechanism; in response to receiving the user input representing the movement of the rotatable input mechanism, displaying a landing screen of the music application, wherein the landing screen includes display of a playlist affordance, an artist list affordance, and a song list affordance; receiving user input associated with the landing screen; determining whether the user input associated with the landing screen represents a touch associated with the playlist affordance, the artist list affordance, or the song list affordance; in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the playlist affordance, displaying, on the display, one or more playlist selection affordances; in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the artist list affordance, displaying, on the display, one or more artist selection affordances; and in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the song list affordance, displaying, on the display, one or more song selection affordances. 
     In some embodiments, an electronic device comprises: a display; a rotatable input mechanism; means for displaying an affordance representing a music application; means for receiving user input representing movement of the rotatable input mechanism; means, responsive to receiving the user input representing the movement of the rotatable input mechanism, for displaying a landing screen of the music application, wherein the landing screen includes display of a playlist affordance, an artist list affordance, and a song list affordance; means for receiving user input associated with the landing screen; means for determining whether the user input associated with the landing screen represents a touch associated with the playlist affordance, the artist list affordance, or the song list affordance; means, responsive to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the playlist affordance, for displaying one or more playlist selection affordances; means, responsive to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the artist list affordance, for displaying one or more artist selection affordances; and means, responsive to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the song list affordance, for displaying one or more song selection affordances. 
     In some embodiments, an electronic device comprises: a display unit configured to display a graphic user interface; a rotatable input mechanism unit configured to receive movements; and a processing unit coupled to the display unit and the rotatable input mechanism unit, the processing unit configured to: enable display of, on the display, an affordance representing a music application; receive user input representing movement of the rotatable input mechanism; in response to receiving the user input representing the movement of the rotatable input mechanism, enable display of a landing screen of the music application, wherein the landing screen includes display of a playlist affordance, an artist list affordance, and a song list affordance; receive user input associated with the landing screen; determine whether the user input associated with the landing screen represents a touch associated with the playlist affordance, the artist list affordance, or the song list affordance; in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the playlist affordance, enable display of, on the display, one or more playlist selection affordances; in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the artist list affordance, enable display of, on the display, one or more artist selection affordances; and in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the song list affordance, enable display of, on the display, one or more song selection affordances. 
     In some embodiments, a method is performed at an electronic device with a display, a touch-sensitive surface, and a rotatable input mechanism. The method comprises: displaying an audio playback user interface; receiving a first user input representing movement of the rotatable input mechanism in a rotation direction; in response to receiving the first user input representing the movement of the rotatable input mechanism in the rotation direction, ceasing display of the audio playback user interface and displaying a navigation screen of a music application, wherein the navigation screen includes a playlist affordance, an artist list affordance, and a song list affordance; receiving a second user input associated with the navigation screen; determining whether the second user input represents a contact on the touch-sensitive surface associated with the playlist affordance, the artist list affordance, or the song list affordance; in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the playlist affordance, ceasing display of the navigation screen and displaying a first playlist user interface of two or more playlist user interfaces; in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the artist list affordance, ceasing display of the navigation screen and displaying an artist user interface of two or more artist user interfaces; and in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the song list affordance, ceasing display of the navigation screen and displaying a song user interface of one or more song user interfaces. 
     In some embodiments, a non-transitory computer-readable storage medium stores one or more programs, the one or more programs comprising instructions, which when executed by an electronic device with a display, a rotatable input mechanism, and a touch-sensitive surface cause the device to: display an audio playback user interface; receive a first user input representing movement of the rotatable input mechanism in a rotation direction; in response to receiving the first user input representing the movement of the rotatable input mechanism in the rotation direction, cease display of the audio playback user interface and display a navigation screen of a music application, wherein the navigation screen includes a playlist affordance, an artist list affordance, and a song list affordance; receive a second user input associated with the navigation screen; determine whether the second user input represents a contact on the touch-sensitive surface associated with the playlist affordance, the artist list affordance, or the song list affordance; in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the playlist affordance, cease display of the navigation screen and display a first playlist user interface of two or more playlist user interfaces; in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the artist list affordance, cease display of the navigation screen and display an artist user interface of two or more artist user interfaces; and in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the song list affordance, cease display of the navigation screen and display a song user interface of one or more song user interfaces. 
     In some embodiments, an electronic comprises: a display; a rotatable input mechanism; a touch-sensitive surface; one or more processors; memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for: displaying an audio playback user interface; receiving a first user input representing movement of the rotatable input mechanism in a rotation direction; in response to receiving the first user input representing the movement of the rotatable input mechanism in the rotation direction, ceasing display of the audio playback user interface and displaying a navigation screen of a music application, wherein the navigation screen includes a playlist affordance, an artist list affordance, and a song list affordance; receiving a second user input associated with the navigation screen; determining whether the second user input represents a contact on the touch-sensitive surface associated with the playlist affordance, the artist list affordance, or the song list affordance; in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the playlist affordance, ceasing display of the navigation screen and displaying a first playlist user interface of two or more playlist user interfaces; in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the artist list affordance, ceasing display of the navigation screen and displaying an artist user interface of two or more artist user interfaces; and in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the song list affordance, ceasing display of the navigation screen and displaying a song user interface of one or more song user interfaces. 
     In some embodiments, an electronic device comprises: a display; a rotatable input mechanism; a touch-sensitive surface configured to detect intensity of touches; means for displaying an audio playback user interface; means for receiving a first user input representing movement of the rotatable input mechanism in a rotation direction; means, responsive to receiving the first user input representing the movement of the rotatable input mechanism in the rotation direction, for ceasing display of the audio playback user interface and displaying a navigation screen of a music application, wherein the navigation screen includes a playlist affordance, an artist list affordance, and a song list affordance; means for receiving a second user input associated with the navigation screen; means for determining whether the second user input represents a contact on the touch-sensitive surface associated with the playlist affordance, the artist list affordance, or the song list affordance; means, responsive to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the playlist affordance, for ceasing display of the navigation screen and displaying a first playlist user interface of two or more playlist user interfaces; means, responsive to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the artist list affordance, for ceasing display of the navigation screen and displaying an artist user interface of two or more artist user interfaces; and means, responsive to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the song list affordance, for ceasing display of the navigation screen and displaying a song user interface of one or more song user interfaces. 
     In some embodiments, an electronic device comprises: a display unit configured to display a graphic user interface; a rotatable input mechanism unit configured to receive movements; a touch-sensitive surface unit configured to receive contacts; and a processing unit coupled to the display unit, the rotatable input mechanism unit, and the touch-sensitive surface unit, the processing unit configured to: enable display of an audio playback user interface; receive a first user input representing movement of the rotatable input mechanism in a rotation direction; in response to receiving the first user input representing the movement of the rotatable input mechanism in the rotation direction, cease display of the audio playback user interface and enable display of a navigation screen of a music application, wherein the navigation screen includes a playlist affordance, an artist list affordance, and a song list affordance; receive a second user input associated with the navigation screen; determine whether the second user input represents a contact on the touch-sensitive surface associated with the playlist affordance, the artist list affordance, or the song list affordance; in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the playlist affordance, cease display of the navigation screen and enable display of a first playlist user interface of two or more playlist user interfaces; in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the artist list affordance, cease display of the navigation screen and enable display of an artist user interface of two or more artist user interfaces; and in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the song list affordance, cease display of the navigation screen and enable display of a song user interface of one or more song user interfaces. 
     In some embodiments, a method is performed at an electronic device with a display, a touch-sensitive surface, and a rotatable input mechanism. The method comprises: displaying a first audio playback user interface; receiving user input representing movement of the rotatable input mechanism; in response to receiving the user input representing the movement of the rotatable input mechanism, ceasing display of the first audio playback user interface and displaying a first user interface of a first set of user interfaces; receiving a first user input representing a directional swipe on the touch-sensitive surface; determining whether the first user input represents a swipe in a first direction or a second direction; in response to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the first direction, ceasing display of the first user interface of the first set of user interfaces and displaying a first user interface of a second set of user interfaces; and in response to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the second direction, ceasing display of the first user interface of the first set of user interfaces and displaying a first user interface of a third set of user interfaces. 
     In some embodiments, a non-transitory computer-readable storage medium stores one or more programs, the one or more programs comprising instructions, which when executed by an electronic device with a display, a rotatable input mechanism, and a touch-sensitive surface cause the device to: display a first audio playback user interface; receive user input representing movement of the rotatable input mechanism; in response to receiving the user input representing the movement of the rotatable input mechanism, cease display of the first audio playback user interface and display a first user interface of a first set of user interfaces; receive a first user input representing a directional swipe on the touch-sensitive surface; determine whether the first user input represents a swipe in a first direction or a second direction; in response to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the first direction, cease display of the first user interface of the first set of user interfaces and display a first user interface of a second set of user interfaces; and in response to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the second direction, cease display of the first user interface of the first set of user interfaces and display a first user interface of a third set of user interfaces. 
     In some embodiments, an electronic device comprises: a display; a rotatable input mechanism; a touch-sensitive surface; one or more processors; memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for: displaying a first audio playback user interface; receiving user input representing movement of the rotatable input mechanism; in response to receiving the user input representing the movement of the rotatable input mechanism, ceasing display of the first audio playback user interface and displaying a first user interface of a first set of user interfaces; receiving a first user input representing a directional swipe on the touch-sensitive surface; determining whether the first user input represents a swipe in a first direction or a second direction; in response to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the first direction, ceasing display of the first user interface of the first set of user interfaces and displaying a first user interface of a second set of user interfaces; and in response to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the second direction, ceasing display of the first user interface of the first set of user interfaces and displaying a first user interface of a third set of user interfaces. 
     In some embodiments, an electronic device comprises: a display; a rotatable input mechanism; a touch-sensitive surface configured to detect intensity of touches; means for displaying a first audio playback user interface; means for receiving user input representing movement of the rotatable input mechanism; means, responsive to receiving the user input representing the movement of the rotatable input mechanism, for ceasing display of the first audio playback user interface and displaying a first user interface of a first set of user interfaces; means for receiving a first user input representing a directional swipe on the touch-sensitive surface; means for determining whether the first user input represents a swipe in a first direction or a second direction; means, responsive to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the first direction, for ceasing display of the first user interface of the first set of user interfaces and displaying a first user interface of a second set of user interfaces; and means, responsive to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the second direction, for ceasing display of the first user interface of the first set of user interfaces and displaying a first user interface of a third set of user interfaces. 
     In some embodiments, an electronic device comprises: a display unit configured to display a graphic user interface; a touch-sensitive surface unit configured to receive contacts; a rotatable input mechanism unit configured to receive movements; and a processing unit coupled to the display unit, the touch-sensitive surface unit, and the rotatable input mechanism unit, the processing unit configured to: enable display of a first audio playback user interface; receive user input representing movement of the rotatable input mechanism; in response to receiving the user input representing the movement of the rotatable input mechanism, cease display of the first audio playback user interface and enable display of a first user interface of a first set of user interfaces; receive a first user input representing a directional swipe on the touch-sensitive surface; determine whether the first user input represents a swipe in a first direction or a second direction; in response to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the first direction, cease display of the first user interface of the first set of user interfaces and enable display of a first user interface of a second set of user interfaces; and in response to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the second direction, cease display of the first user interface of the first set of user interfaces and enable display of a first user interface of a third set of user interfaces. 
     In some embodiments, a method is performed at an electronic device with a display and a rotatable input mechanism. The method comprises: displaying an audio playback user interface; receiving a first user input representing a directional swipe in a first direction; in response to receiving the first user input, ceasing display of the audio playback user interface and displaying a first user interface of a first set of user interfaces, the first user interface of the first set of user interfaces comprising a selection affordance; while displaying a user interface of the first set of user interfaces, receiving a second user input representing a directional swipe in a second direction; and in response to receiving the second user input, ceasing display of the first user interface of a first set of user interfaces and displaying the audio playback user interface. 
     In some embodiments, a non-transitory computer-readable storage medium stores one or more programs, the one or more programs comprising instructions, which when executed by an electronic device with a display and a rotatable input mechanism cause the device to: display an audio playback user interface; receive a first user input representing a directional swipe in a first direction; in response to receiving the first user input, cease display of the audio playback user interface and display a first user interface of a first set of user interfaces, the first user interface of the first set of user interfaces comprising a selection affordance; while displaying a user interface of the first set of user interfaces, receive a second user input representing a directional swipe in a second direction; and in response to receiving the second user input, cease display of the first user interface of a first set of user interfaces and display the audio playback user interface. 
     In some embodiments, an electronic device comprises: a display; a rotatable input mechanism; a touch-sensitive surface configured to detect intensity of touches; one or more processors; memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for: displaying an audio playback user interface; receiving a first user input representing a directional swipe in a first direction; in response to receiving the first user input, ceasing display of the audio playback user interface and displaying a first user interface of a first set of user interfaces, the first user interface of the first set of user interfaces comprising a selection affordance; while displaying a user interface of the first set of user interfaces, receiving a second user input representing a directional swipe in a second direction; and in response to receiving the second user input, ceasing display of the first user interface of a first set of user interfaces and displaying the audio playback user interface. 
     In some embodiments, an electronic device comprises: a display; a rotatable input mechanism; a touch-sensitive surface configured to detect intensity of touches; means for displaying an audio playback user interface; means for receiving a first user input representing a directional swipe in a first direction; means, responsive to receiving the first user input, for ceasing display of the audio playback user interface and displaying a first user interface of a first set of user interfaces, the first user interface of the first set of user interfaces comprising a selection affordance; means, while displaying a user interface of the first set of user interfaces, for receiving a second user input representing a directional swipe in a second direction; and means, responsive to receiving the second user input, for ceasing display of the first user interface of the first set of user interfaces and displaying the audio playback user interface. 
     In some embodiments, an electronic device comprises: a display unit configured to display a graphic user interface; a rotatable input mechanism unit configured to receive movements; and a processing unit coupled to the display unit and the rotatable input mechanism unit, the processing unit configured to: enable display of an audio playback user interface; receive a first user input representing a directional swipe in a first direction; in response to receiving the first user input, cease display of the audio playback user interface and enable display of a first user interface of a first set of user interfaces, the first user interface of the first set of user interfaces comprising a selection affordance; while displaying a user interface of the first set of user interfaces, receive a second user input representing a directional swipe in a second direction; and in response to receiving the second user input, cease display of the first user interface of a first set of user interfaces and enable display of the audio playback user interface. 
     In some embodiments, a method is performed at an electronic device with a display and a touch-sensitive surface configured to detect intensity of touches. The method comprises: displaying an audio playback user interface; while displaying the audio playback user interface, receiving user input representing a first contact on the touch-sensitive surface; determining whether a characteristic intensity of the first contact exceeds an intensity threshold; in accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold, ceasing display of the audio playback user interface and displaying a first set of affordances; receiving user input representing a second contact associated with an affordance of the first set of affordances; in response to receiving the second contact, ceasing display of the first set of affordances and displaying a first user interface of a first set of user interfaces; and in accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold, forgoing display of the first set of affordances. 
     In some embodiments, a non-transitory computer-readable storage medium stores one or more programs, the one or more programs comprising instructions, which when executed by an electronic device with a display and a touch-sensitive surface configured to detect intensity of touches cause the device to: display an audio playback user interface; while displaying the audio playback user interface, receive user input representing a first contact on the touch-sensitive surface; determine whether a characteristic intensity of the first contact exceeds an intensity threshold; in accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold, cease display of the audio playback user interface and display a first set of affordances; receive user input representing a second contact associated with an affordance of the first set of affordances; in response to receiving the second contact, cease display of the first set of affordances and display a first user interface of a first set of user interfaces; and in accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold, forgo display of the first set of affordances. 
     In some embodiments, an electronic device comprises: a display; a touch-sensitive surface configured to detect intensity of touches; one or more processors; memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for: displaying an audio playback user interface; while displaying the audio playback user interface, receiving user input representing a first contact on the touch-sensitive surface; determining whether a characteristic intensity of the first contact exceeds an intensity threshold; in accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold, ceasing display of the audio playback user interface and displaying a first set of affordances; receiving user input representing a second contact associated with an affordance of the first set of affordances; in response to receiving the second contact, ceasing display of the first set of affordances and displaying a first user interface of a first set of user interfaces; and in accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold, forgoing display of the first set of affordances. 
     In some embodiments, an electronic device comprises: a display; a touch-sensitive surface configured to detect intensity of touches; means for displaying an audio playback user interface; means, while displaying the audio playback user interface, for receiving user input representing a first contact on the touch-sensitive surface; means for determining whether a characteristic intensity of the first contact exceeds an intensity threshold; means, in accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold, for ceasing display of the audio playback user interface and displaying a first set of affordances; means for receiving user input representing a second contact associated with an affordance of the first set of affordances; means, responsive to receiving the second contact, for ceasing display of the first set of affordances and displaying a first user interface of a first set of user interfaces; and means, in accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold, for forgoing display of the first set of affordances. 
     In some embodiments, an electronic device comprises: a display unit configured to display a graphic user interface; a touch-sensitive surface unit configured to detect intensity of touches; and a processing unit coupled to the display unit, the rotatable input mechanism unit, and the touch-sensitive surface unit, the processing unit configured to: enable display of an audio playback user interface; while displaying the audio playback user interface, receive user input representing a first contact on the touch-sensitive surface; determine whether a characteristic intensity of the first contact exceeds an intensity threshold; in accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold, cease display of the audio playback user interface and enable display of a first set of affordances; receive user input representing a second contact associated with an affordance of the first set of affordances; in response to receiving the second contact, cease display of the first set of affordances and enable display of a first user interface of a first set of user interfaces; and in accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold, forgo display of the first set of affordances. 
     In some embodiments, a method is performed at an electronic device with a display, a rotatable input mechanism, and a touch-sensitive surface configured to detect intensity of touches. The method comprises: displaying a first audio playback user interface; receiving user input representing a first movement of the rotatable input mechanism; in response to receiving the user input representing the first movement of the rotatable input mechanism, ceasing display of the first audio playback user interface and displaying a first user interface of a first set of user interfaces; while displaying a user interface of the first set of user interfaces, receiving user input representing a first contact on the touch-sensitive surface; determining whether a characteristic intensity of the first contact exceeds an intensity threshold; in accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold, ceasing display of first set of user interfaces and displaying a first set of affordances; receiving user input associated with a first affordance of the first set of affordances; in response to receiving the user input associated with the first affordance of the first set of affordances, ceasing display of the first set of affordances and displaying a first user interface of a second set of user interfaces; and in accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold, forgoing display of the first set of affordances. 
     In some embodiments, a non-transitory computer-readable storage medium stores one or more programs, the one or more programs comprising instructions, which when executed by an electronic device with a display, a rotatable input mechanism, and a touch-sensitive surface configured to detect intensity of touches cause the device to: display a first audio playback user interface; receive user input representing a first movement of the rotatable input mechanism; in response to receiving the user input representing the first movement of the rotatable input mechanism, cease display of the first audio playback user interface and display a first user interface of a first set of user interfaces; while displaying a user interface of the first set of user interfaces, receive user input representing a first contact on the touch-sensitive surface; determine whether a characteristic intensity of the first contact exceeds an intensity threshold; in accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold, cease display of first set of user interfaces and display a first set of affordances; receive user input associated with a first affordance of the first set of affordances; in response to receiving the user input associated with the first affordance of the first set of affordances, cease display of the first set of affordances and display a first user interface of a second set of user interfaces; and in accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold, forgo display of the first set of affordances. 
     In some embodiments, an electronic device comprises: a display; a rotatable input mechanism; a touch-sensitive surface configured to detect intensity of touches; one or more processors; memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for: displaying a first audio playback user interface; receiving user input representing a first movement of the rotatable input mechanism; in response to receiving the user input representing the first movement of the rotatable input mechanism, ceasing display of the first audio playback user interface and displaying a first user interface of a first set of user interfaces; while displaying a user interface of the first set of user interfaces, receiving user input representing a first contact on the touch-sensitive surface; determining whether a characteristic intensity of the first contact exceeds an intensity threshold; in accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold, ceasing display of first set of user interfaces and displaying a first set of affordances; receiving user input associated with a first affordance of the first set of affordances; in response to receiving the user input associated with the first affordance of the first set of affordances, ceasing display of the first set of affordances and displaying a first user interface of a second set of user interfaces; and in accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold, forgoing display of the first set of affordances. 
     In some embodiments, an electronic device comprises: a display; a rotatable input mechanism; a touch-sensitive surface configured to detect intensity of touches; means for displaying a first audio playback user interface; means for receiving user input representing a first movement of the rotatable input mechanism; means, responsive to receiving the user input representing the first movement of the rotatable input mechanism, for ceasing display of the first audio playback user interface and displaying a first user interface of a first set of user interfaces; means, while displaying a user interface of the first set of user interfaces, for receiving user input representing a first contact on the touch-sensitive surface; means for determining whether a characteristic intensity of the first contact exceeds an intensity threshold; means, in accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold, for ceasing display of first set of user interfaces and displaying a first set of affordances; means for receiving user input associated with a first affordance of the first set of affordances; means, responsive to receiving the user input associated with the first affordance of the first set of affordances, for ceasing display of the first set of affordances and displaying a first user interface of a second set of user interfaces; and means, in accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold, for forgoing display of the first set of affordances. 
     In some embodiments, an electronic device comprises: a display unit configured to display a graphic user interface; a rotatable input mechanism unit configured to receive movements; a touch-sensitive surface unit configured to detect intensity of touches; and a processing unit coupled to the display unit, the rotatable input mechanism unit, and the touch-sensitive surface unit, the processing unit configured to: enable display of a first audio playback user interface; receive user input representing a first movement of the rotatable input mechanism; in response to receiving the user input representing the first movement of the rotatable input mechanism, cease display of the first audio playback user interface and enable display of a first user interface of a first set of user interfaces; while displaying a user interface of the first set of user interfaces, receive user input representing a first contact on the touch-sensitive surface; determine whether a characteristic intensity of the first contact exceeds an intensity threshold; in accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold, cease display of first set of user interfaces and enable display of a first set of affordances; receive user input associated with a first affordance of the first set of affordances; in response to receiving the user input associated with the first affordance of the first set of affordances, cease display of the first set of affordances and enable display of a first user interface of a second set of user interfaces; and in accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold, forgo display of the first set of affordances. 
     In some embodiments, a method is performed at an electronic device with a display and a rotatable input mechanism. The method comprises: displaying a first audio application user interface; while displaying the first audio application user interface, receiving a first user input representing movement of the rotatable input mechanism in a rotation direction; in response to receiving the first user input, ceasing display of the first audio application user interface and displaying a second audio application user interface; while displaying the second audio application user interface, receiving a second user input representing movement of the rotatable input mechanism in the rotation direction; and in response to receiving the second user input, ceasing display of the second audio application user interface and displaying a third audio application user interface. 
     In some embodiments, a non-transitory computer-readable storage medium stores one or more programs, the one or more programs comprising instructions, which when executed by an electronic device with a display and a rotatable input mechanism cause the device to: display a first audio application user interface; while displaying the first audio application user interface, receive a first user input representing movement of the rotatable input mechanism in a rotation direction; in response to receiving the first user input, cease display of the first audio application user interface and display a second audio application user interface; while displaying the second audio application user interface, receive a second user input representing movement of the rotatable input mechanism in the rotation direction; and in response to receiving the second user input, cease display of the second audio application user interface and display a third audio application user interface. 
     In some embodiments, an electronic device comprises: a display; a rotatable input mechanism; one or more processors; memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for: displaying a first audio application user interface; while displaying the first audio application user interface, receiving a first user input representing movement of the rotatable input mechanism in a rotation direction; in response to receiving the first user input, ceasing display of the first audio application user interface and displaying a second audio application user interface; while displaying the second audio application user interface, receiving a second user input representing movement of the rotatable input mechanism in the rotation direction; and in response to receiving the second user input, ceasing display of the second audio application user interface and displaying a third audio application user interface. 
     In some embodiments, an electronic device comprises: a display; a rotatable input mechanism; means for displaying a first audio application user interface; while displaying the first audio application user interface, means for receiving a first user input representing movement of the rotatable input mechanism in a rotation direction; means, responsive to receiving the first user input, for ceasing display of the first audio application user interface and displaying a second audio application user interface; while displaying the second audio application user interface, means for receiving a second user input representing movement of the rotatable input mechanism in the rotation direction; and means, responsive to receiving the second user input, for ceasing display of the second audio application user interface and displaying a third audio application user interface. 
     In some embodiments, an electronic device comprises: a display unit configured to display a graphic user interface; a rotatable input mechanism unit configured to receive movements; and a processing unit coupled to the display unit and the rotatable input mechanism unit, the processing unit configured to: enable display of a first audio application user interface; while displaying the first audio application user interface, receive a first user input representing movement of the rotatable input mechanism in a rotation direction; in response to receiving the first user input, cease display of the first audio application user interface and enable display of a second audio application user interface; while displaying the second audio application user interface, receive a second user input representing movement of the rotatable input mechanism in the rotation direction; and in response to receiving the second user input, cease display of the second audio application user interface and enable display of a third audio application user interface. 
     In some embodiments, a method is performed at an electronic device with a display, a touch-sensitive surface, and a rotatable input mechanism. The method comprises: displaying a first audio playback user interface; while displaying the first audio playback user interface, receiving a first user input representing movement of the rotatable input mechanism; in response to receiving the first user input, ceasing display of the first audio playback user interface and displaying a first user interface of a first set of user interfaces; while displaying a user interface of the first set of user interfaces, receiving a second user input representing a swipe in a first direction; in response to receiving the second user input, replacing display of a portion of the user interface of the first set of user interfaces with display of a navigation interface, wherein the navigation interface comprises a first navigation affordance associated with the first set of user interfaces and a second navigation affordance associated with a second set of user interfaces; receiving a third user input associated with the second navigation affordance of the navigation interface; and in response to receiving the third user input, ceasing display of the first set of user interfaces and the navigation interface and displaying a first user interface of the second set of user interfaces. 
     In some embodiments, a non-transitory computer-readable storage medium stores one or more programs, the one or more programs comprising instructions, which when executed by an electronic device with a display, a rotatable input mechanism, and a touch-sensitive surface cause the device to: display a first audio playback user interface; while displaying the first audio playback user interface, receive a first user input representing movement of the rotatable input mechanism; in response to receiving the first user input, cease display of the first audio playback user interface and display a first user interface of a first set of user interfaces; while displaying a user interface of the first set of user interfaces, receive a second user input representing a swipe in a first direction; in response to receiving the second user input, replace display of a portion of the user interface of the first set of user interfaces with display of a navigation interface, wherein the navigation interface comprises a first navigation affordance associated with the first set of user interfaces and a second navigation affordance associated with a second set of user interfaces, receive a third user input associated with the second navigation affordance of the navigation interface; and in response to receiving the third user input, cease display of the first set of user interfaces and the navigation interface and display a first user interface of the second set of user interfaces. 
     In some embodiments, an electronic device comprises: a display; a rotatable input mechanism; a touch-sensitive surface; one or more processors; memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for: displaying a first audio playback user interface; while displaying the first audio playback user interface, receiving a first user input representing movement of the rotatable input mechanism; in response to receiving the first user input, ceasing display of the first audio playback user interface and displaying a first user interface of a first set of user interfaces; while displaying a user interface of the first set of user interfaces, receiving a second user input representing a swipe in a first direction; in response to receiving the second user input, replacing display of a portion of the user interface of the first set of user interfaces with display of a navigation interface, wherein the navigation interface comprises a first navigation affordance associated with the first set of user interfaces and a second navigation affordance associated with a second set of user interfaces, receiving a third user input associated with the second navigation affordance of the navigation interface; and in response to receiving the third user input, ceasing display of the first set of user interfaces and the navigation interface and displaying a first user interface of the second set of user interfaces. 
     In some embodiments, an electronic device comprises: a display; a rotatable input mechanism; a touch-sensitive surface; means for displaying a first audio playback user interface; means, while displaying the first audio playback user interface, for receiving a first user input representing movement of the rotatable input mechanism; means, responsive to receiving the first user input, for ceasing display of the first audio playback user interface and displaying a first user interface of a first set of user interfaces; means, while displaying a user interface of the first set of user interfaces, for receiving a second user input representing a swipe in a first direction; means, responsive to receiving the second user input, for replacing display of a portion of the user interface of the first set of user interfaces with display of a navigation interface, wherein the navigation interface comprises a first navigation affordance associated with the first set of user interfaces and a second navigation affordance associated with a second set of user interfaces, means for receiving a third user input associated with the second navigation affordance of the navigation interface; and means, responsive to receiving the third user input, for ceasing display of the first set of user interfaces and the navigation interface and displaying a first user interface of the second set of user interfaces. 
     In some embodiments, an electronic device comprises: a display unit configured to display a graphic user interface; a rotatable input mechanism unit configured to receive movements; a touch-sensitive surface unit configured to receive contacts; and a processing unit coupled to the display unit, the rotatable input mechanism unit, and the touch-sensitive surface unit, the processing unit configured to: enable display of a first audio playback user interface; while displaying the first audio playback user interface, receive a first user input representing movement of the rotatable input mechanism; in response to receiving the first user input, cease display of the first audio playback user interface and enable display of a first user interface of a first set of user interfaces; while displaying a user interface of the first set of user interfaces, receive a second user input representing a swipe in a first direction; in response to receiving the second user input, replace display of a portion of the user interface of the first set of user interfaces with display of a navigation interface, wherein the navigation interface comprises a first navigation affordance associated with the first set of user interfaces and a second navigation affordance associated with a second set of user interfaces; receive a third user input associated with the second navigation affordance of the navigation interface; and in response to receiving the third user input, cease display of the first set of user interfaces and the navigation interface and enable display of a first user interface of the second set of user interfaces. 
     Thus, devices are provided with faster, more efficient methods and interfaces for accessing and playing music, thereby increasing the effectiveness, efficiency, and user satisfaction with such devices. Such methods and interfaces may complement or replace conventional methods for accessing and playing music. 
    
    
     
       DESCRIPTION OF THE FIGURES 
       For a better understanding of the various described embodiments, reference should be made to the Description of Embodiments below, in conjunction with the following drawings in which like reference numerals refer to corresponding parts throughout the figures. 
         FIG. 1A  is a block diagram illustrating a portable multifunction device with a touch-sensitive display in accordance with some embodiments. 
         FIG. 1B  is a block diagram illustrating exemplary components for event handling in accordance with some embodiments. 
         FIG. 2  illustrates a portable multifunction device having a touch screen in accordance with some embodiments. 
         FIG. 3  is a block diagram of an exemplary multifunction device with a display and a touch-sensitive surface in accordance with some embodiments. 
         FIG. 4A  illustrates an exemplary user interface for a menu of applications on a portable multifunction device in accordance with some embodiments. 
         FIG. 4B  illustrates an exemplary user interface for a multifunction device with a touch-sensitive surface that is separate from the display in accordance with some embodiments. 
         FIG. 5A  illustrates a personal electronic device in accordance with some embodiments. 
         FIG. 5B  is a block diagram illustrating a personal electronic device in accordance with some embodiments. 
         FIGS. 5C-5D  illustrate exemplary components of a personal electronic device having a touch-sensitive display and intensity sensors in accordance with some embodiments. 
         FIGS. 5E-5H  illustrate exemplary components and user interfaces of a personal electronic device in accordance with some embodiments. 
         FIGS. 6A-6D  illustrate exemplary user interfaces for accessing and playing music. 
         FIG. 7  is a flow diagram illustrating an exemplary process for accessing and playing music. 
         FIG. 8  illustrates a functional block diagram of an electronic device in accordance with some embodiments. 
         FIGS. 9A-9C  illustrate exemplary user interfaces in accordance with some embodiments. 
         FIG. 10  is a flow diagram illustrating an exemplary process for accessing and playing music. 
         FIGS. 11A-11C  illustrate exemplary user interfaces in accordance with some embodiments. 
         FIG. 12  is a flow diagram illustrating an exemplary process for accessing and playing music. 
         FIGS. 13A-13C  illustrate exemplary user interfaces in accordance with some embodiments. 
         FIG. 14  is a flow diagram illustrating an exemplary process for accessing and playing music. 
         FIGS. 15A-15C  illustrate exemplary user interfaces in accordance with some embodiments. 
         FIG. 16  is a flow diagram illustrating an exemplary process for accessing and playing music. 
         FIGS. 17A-17C  illustrate exemplary user interfaces in accordance with some embodiments. 
         FIG. 18  is a flow diagram illustrating an exemplary process for accessing and playing music. 
         FIGS. 19A-19C  illustrate exemplary user interfaces in accordance with some embodiments. 
         FIG. 20  is a flow diagram illustrating an exemplary process for accessing and playing music. 
         FIG. 21A-21C  illustrate exemplary user interfaces in accordance with some embodiments. 
         FIG. 22  is a flow diagram illustrating an exemplary process for accessing and playing music. 
         FIG. 23  illustrates an exemplary user interface in accordance with some embodiments. 
         FIG. 24  illustrate an exemplary user interface in accordance with some embodiments. 
         FIG. 25  illustrates a function block diagram of an electronic device in accordance with some embodiments. 
         FIG. 26  illustrates a function block diagram of an electronic device in accordance with some embodiments. 
         FIG. 27  illustrates a function block diagram of an electronic device in accordance with some embodiments. 
         FIG. 28  illustrates a function block diagram of an electronic device in accordance with some embodiments. 
         FIG. 29  illustrates a function block diagram of an electronic device in accordance with some embodiments. 
         FIG. 30  illustrates a function block diagram of an electronic device in accordance with some embodiments. 
         FIG. 31  illustrates a function block diagram of an electronic device in accordance with some embodiments. 
         FIG. 32  illustrates a function block diagram of an electronic device in accordance with some embodiments. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     The following description sets forth exemplary methods, parameters and the like. It should be recognized, however, that such description is not intended as a limitation on the scope of the present disclosure but is instead provided as a description of exemplary embodiments. 
     There is a need for electronic devices that provide efficient music access to a user for playback. For example, ease of use for viewing music, playing music, shuffling music, and repeating music contribute to the efficiency of music access. Such techniques can reduce the cognitive burden on a user who accesses and plays music, thereby enhancing productivity. Further, such techniques can reduce processor and battery power otherwise wasted on redundant user inputs. 
     Below,  FIGS. 1A-1B, 2, 3, 4A-4B, and 5A-5B  provide a description of exemplary devices for performing the techniques for accessing and playing music.  FIGS. 6A-6D, 9A-9C, 11A-11C, 13A-13C, 15A-15C, 17A-17C, 19A-19C, 21A-21C, and 23  illustrate exemplary user interfaces for accessing and playing music. The user interfaces in the figures are also used to illustrate the processes described below, including the process in  FIGS. 7, 10, 12, 14, 16, 18, 20 , and  22 . 
     Although the following description uses terms “first,” “second,” etc. to describe various elements, these elements should not be limited by the terms. These terms are only used to distinguish one element from another. For example, a first touch could be termed a second touch, and, similarly, a second touch could be termed a first touch, without departing from the scope of the various described embodiments. The first touch and the second touch are both touches, but they are not the same touch. 
     The terminology used in the description of the various described embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various described embodiments and the appended claims, the singular forms “a”, “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term “and/or” as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. It will be further understood that the terms “includes,” “including,” “comprises,” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     The term “if” is, optionally, construed to mean “when” or “upon” or “in response to determining” or “in response to detecting,” depending on the context. Similarly, the phrase “if it is determined” or “if [a stated condition or event] is detected” is, optionally, construed to mean “upon determining” or “in response to determining” or “upon detecting [the stated condition or event]” or “in response to detecting [the stated condition or event],” depending on the context. 
     Embodiments of electronic devices, user interfaces for such devices, and associated processes for using such devices are described. In some embodiments, the device is a portable communications device, such as a mobile telephone, that also contains other functions, such as PDA and/or music player functions. Exemplary embodiments of portable multifunction devices include, without limitation, the iPhone®, iPod Touch®, and iPad® devices from Apple Inc. of Cupertino, Calif. Other portable electronic devices, such as laptops or tablet computers with touch-sensitive surfaces (e.g., touch screen displays and/or touchpads), are, optionally, used. It should also be understood that, in some embodiments, the device is not a portable communications device, but is a desktop computer with a touch-sensitive surface (e.g., a touch screen display and/or a touchpad). 
     In the discussion that follows, an electronic device that includes a display and a touch-sensitive surface is described. It should be understood, however, that the electronic device optionally includes one or more other physical user-interface devices, such as a physical keyboard, a mouse, and/or a joystick. 
     The device typically supports a variety of applications, such as one or more of the following: a drawing application, a presentation application, a word processing application, a website creation application, a disk authoring application, a spreadsheet application, a gaming application, a telephone application, a video conferencing application, an e-mail application, an instant messaging application, a workout support application, a photo management application, a digital camera application, a digital video camera application, a web browsing application, a digital music player application, and/or a digital video player application. 
     The various applications that are executed on the device optionally use at least one common physical user-interface device, such as the touch-sensitive surface. One or more functions of the touch-sensitive surface as well as corresponding information displayed on the device are, optionally, adjusted and/or varied from one application to the next and/or within a respective application. In this way, a common physical architecture (such as the touch-sensitive surface) of the device optionally supports the variety of applications with user interfaces that are intuitive and transparent to the user. 
     Attention is now directed toward embodiments of portable devices with touch-sensitive displays.  FIG. 1A  is a block diagram illustrating portable multifunction device  100  with touch-sensitive display system  112  in accordance with some embodiments. Touch-sensitive display  112  is sometimes called a “touch screen” for convenience and is sometimes known as or called a “touch-sensitive display system.” Device  100  includes memory  102  (which optionally includes one or more computer-readable storage mediums), memory controller  122 , one or more processing units (CPUs)  120 , peripherals interface  118 , RF circuitry  108 , audio circuitry  110 , speaker  111 , microphone  113 , input/output (I/O) subsystem  106 , other input control devices  116 , and external port  124 . Device  100  optionally includes one or more optical sensors  164 . Device  100  optionally includes one or more contact intensity sensors  165  for detecting intensity of contacts on device  100  (e.g., a touch-sensitive surface such as touch-sensitive display system  112  of device  100 ). Device  100  optionally includes one or more tactile output generators  167  for generating tactile outputs on device  100  (e.g., generating tactile outputs on a touch-sensitive surface such as touch-sensitive display system  112  of device  100  or touchpad  355  of device  300 ). These components optionally communicate over one or more communication buses or signal lines  103 . 
     As used in the specification and claims, the term “intensity” of a contact on a touch-sensitive surface refers to the force or pressure (force per unit area) of a contact (e.g., a finger contact) on the touch-sensitive surface, or to a substitute (proxy) for the force or pressure of a contact on the touch-sensitive surface. The intensity of a contact has a range of values that includes at least four distinct values and more typically includes hundreds of distinct values (e.g., at least 256). Intensity of a contact is, optionally, determined (or measured) using various approaches and various sensors or combinations of sensors. For example, one or more force sensors underneath or adjacent to the touch-sensitive surface are, optionally, used to measure force at various points on the touch-sensitive surface. In some implementations, force measurements from multiple force sensors are combined (e.g., a weighted average) to determine an estimated force of a contact. Similarly, a pressure-sensitive tip of a stylus is, optionally, used to determine a pressure of the stylus on the touch-sensitive surface. Alternatively, the size of the contact area detected on the touch-sensitive surface and/or changes thereto, the capacitance of the touch-sensitive surface proximate to the contact and/or changes thereto, and/or the resistance of the touch-sensitive surface proximate to the contact and/or changes thereto are, optionally, used as a substitute for the force or pressure of the contact on the touch-sensitive surface. In some implementations, the substitute measurements for contact force or pressure are used directly to determine whether an intensity threshold has been exceeded (e.g., the intensity threshold is described in units corresponding to the substitute measurements). In some implementations, the substitute measurements for contact force or pressure are converted to an estimated force or pressure, and the estimated force or pressure is used to determine whether an intensity threshold has been exceeded (e.g., the intensity threshold is a pressure threshold measured in units of pressure). Using the intensity of a contact as an attribute of a user input allows for user access to additional device functionality that may otherwise not be accessible by the user on a reduced-size device with limited real estate for displaying affordances (e.g., on a touch-sensitive display) and/or receiving user input (e.g., via a touch-sensitive display, a touch-sensitive surface, or a physical/mechanical control such as a knob or a button). 
     As used in the specification and claims, the term “tactile output” refers to physical displacement of a device relative to a previous position of the device, physical displacement of a component (e.g., a touch-sensitive surface) of a device relative to another component (e.g., housing) of the device, or displacement of the component relative to a center of mass of the device that will be detected by a user with the user&#39;s sense of touch. For example, in situations where the device or the component of the device is in contact with a surface of a user that is sensitive to touch (e.g., a finger, palm, or other part of a user&#39;s hand), the tactile output generated by the physical displacement will be interpreted by the user as a tactile sensation corresponding to a perceived change in physical characteristics of the device or the component of the device. For example, movement of a touch-sensitive surface (e.g., a touch-sensitive display or trackpad) is, optionally, interpreted by the user as a “down click” or “up click” of a physical actuator button. In some cases, a user will feel a tactile sensation such as an “down click” or “up click” even when there is no movement of a physical actuator button associated with the touch-sensitive surface that is physically pressed (e.g., displaced) by the user&#39;s movements. As another example, movement of the touch-sensitive surface is, optionally, interpreted or sensed by the user as “roughness” of the touch-sensitive surface, even when there is no change in smoothness of the touch-sensitive surface. While such interpretations of touch by a user will be subject to the individualized sensory perceptions of the user, there are many sensory perceptions of touch that are common to a large majority of users. Thus, when a tactile output is described as corresponding to a particular sensory perception of a user (e.g., an “up click,” a “down click,” “roughness”), unless otherwise stated, the generated tactile output corresponds to physical displacement of the device or a component thereof that will generate the described sensory perception for a typical (or average) user. 
     It should be appreciated that device  100  is only one example of a portable multifunction device, and that device  100  optionally has more or fewer components than shown, optionally combines two or more components, or optionally has a different configuration or arrangement of the components. The various components shown in  FIG. 1A  are implemented in hardware, software, or a combination of both hardware and software, including one or more signal processing and/or application-specific integrated circuits. 
     Memory  102  optionally includes one or more computer-readable storage mediums. The computer-readable storage mediums are optionally tangible and non-transitory. The computer-readable storage mediums are optionally transitory. Memory  102  optionally includes high-speed random access memory and optionally also includes non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid-state memory devices. Memory controller  122  optionally controls access to memory  102  by other components of device  100 . 
     Peripherals interface  118  can be used to couple input and output peripherals of the device to CPU  120  and memory  102 . The one or more processors  120  run or execute various software programs and/or sets of instructions stored in memory  102  to perform various functions for device  100  and to process data. In some embodiments, peripherals interface  118 , CPU  120 , and memory controller  122  are, optionally, implemented on a single chip, such as chip  104 . In some other embodiments, they are, optionally, implemented on separate chips. 
     RF (radio frequency) circuitry  108  receives and sends RF signals, also called electromagnetic signals. RF circuitry  108  converts electrical signals to/from electromagnetic signals and communicates with communications networks and other communications devices via the electromagnetic signals. RF circuitry  108  optionally includes well-known circuitry for performing these functions, including but not limited to an antenna system, an RF transceiver, one or more amplifiers, a tuner, one or more oscillators, a digital signal processor, a CODEC chipset, a subscriber identity module (SIM) card, memory, and so forth. RF circuitry  108  optionally communicates with networks, such as the Internet, also referred to as the World Wide Web (WWW), an intranet and/or a wireless network, such as a cellular telephone network, a wireless local area network (LAN) and/or a metropolitan area network (MAN), and other devices by wireless communication. The RF circuitry  108  optionally includes well-known circuitry for detecting near field communication (NFC) fields, such as by a short-range communication radio. The wireless communication optionally uses any of a plurality of communications standards, protocols, and technologies, including but not limited to Global System for Mobile Communications (GSM), Enhanced Data GSM Environment (EDGE), high-speed downlink packet access (HSDPA), high-speed uplink packet access (HSUPA), Evolution, Data-Only (EV-DO), HSPA, HSPA+, Dual-Cell HSPA (DC-HSPDA), long term evolution (LTE), near field communication (NFC), wideband code division multiple access (W-CDMA), code division multiple access (CDMA), time division multiple access (TDMA), Bluetooth, Bluetooth Low Energy (BTLE), Wireless Fidelity (Wi-Fi) (e.g., IEEE 802.11a, IEEE 802.11b, IEEE 802.11g, IEEE 802.11n, and/or IEEE 802.11ac), voice over Internet Protocol (VoIP), Wi-MAX, a protocol for e-mail (e.g., Internet message access protocol (IMAP) and/or post office protocol (POP)), instant messaging (e.g., extensible messaging and presence protocol (XMPP), Session Initiation Protocol for Instant Messaging and Presence Leveraging Extensions (SIMPLE), Instant Messaging and Presence Service (IMPS)), and/or Short Message Service (SMS), or any other suitable communication protocol, including communication protocols not yet developed as of the filing date of this document. 
     Audio circuitry  110 , speaker  111 , and microphone  113  provide an audio interface between a user and device  100 . Audio circuitry  110  receives audio data from peripherals interface  118 , converts the audio data to an electrical signal, and transmits the electrical signal to speaker  111 . Speaker  111  converts the electrical signal to human-audible sound waves. Audio circuitry  110  also receives electrical signals converted by microphone  113  from sound waves. Audio circuitry  110  converts the electrical signal to audio data and transmits the audio data to peripherals interface  118  for processing. Audio data is, optionally, retrieved from and/or transmitted to memory  102  and/or RF circuitry  108  by peripherals interface  118 . In some embodiments, audio circuitry  110  also includes a headset jack (e.g.,  212 ,  FIG. 2 ). The headset jack provides an interface between audio circuitry  110  and removable audio input/output peripherals, such as output-only headphones or a headset with both output (e.g., a headphone for one or both ears) and input (e.g., a microphone). 
     I/O subsystem  106  couples input/output peripherals on device  100 , such as touch screen  112  and other input control devices  116 , to peripherals interface  118 . I/O subsystem  106  optionally includes display controller  156 , optical sensor controller  158 , intensity sensor controller  159 , haptic feedback controller  161 , and one or more input controllers  160  for other input or control devices. The one or more input controllers  160  receive/send electrical signals from/to other input control devices  116 . The other input control devices  116  optionally include physical buttons (e.g., push buttons, rocker buttons, etc.), dials, slider switches, joysticks, click wheels, and so forth. In some alternate embodiments, input controller(s)  160  are, optionally, coupled to any (or none) of the following: a keyboard, an infrared port, a USB port, and a pointer device such as a mouse. The one or more buttons (e.g.,  208 ,  FIG. 2 ) optionally include an up/down button for volume control of speaker  111  and/or microphone  113 . The one or more buttons optionally include a push button (e.g.,  206 ,  FIG. 2 ). 
     A quick press of the push button optionally disengages a lock of touch screen  112  or optionally begins a process that uses gestures on the touch screen to unlock the device, as described in U.S. patent application Ser. No. 11/322,549, “Unlocking a Device by Performing Gestures on an Unlock Image,” filed Dec. 23, 2005, U.S. Pat. No. 7,657,849, which is hereby incorporated by reference in its entirety. A longer press of the push button (e.g.,  206 ) optionally turns power to device  100  on or off. The functionality of one or more of the buttons are, optionally, user-customizable. Touch screen  112  is used to implement virtual or soft buttons and one or more soft keyboards. 
     Touch-sensitive display  112  provides an input interface and an output interface between the device and a user. Display controller  156  receives and/or sends electrical signals from/to touch screen  112 . Touch screen  112  displays visual output to the user. The visual output optionally includes graphics, text, icons, video, and any combination thereof (collectively termed “graphics”). In some embodiments, some or all of the visual output optionally corresponds to user-interface objects. 
     Touch screen  112  has a touch-sensitive surface, sensor, or set of sensors that accepts input from the user based on haptic and/or tactile contact. Touch screen  112  and display controller  156  (along with any associated modules and/or sets of instructions in memory  102 ) detect contact (and any movement or breaking of the contact) on touch screen  112  and convert the detected contact into interaction with user-interface objects (e.g., one or more soft keys, icons, web pages, or images) that are displayed on touch screen  112 . In an exemplary embodiment, a point of contact between touch screen  112  and the user corresponds to a finger of the user. 
     Touch screen  112  optionally uses LCD (liquid crystal display) technology, LPD (light emitting polymer display) technology, or LED (light emitting diode) technology, although other display technologies are used in other embodiments. Touch screen  112  and display controller  156  optionally detect contact and any movement or breaking thereof using any of a plurality of touch sensing technologies now known or later developed, including but not limited to capacitive, resistive, infrared, and surface acoustic wave technologies, as well as other proximity sensor arrays or other elements for determining one or more points of contact with touch screen  112 . In an exemplary embodiment, projected mutual capacitance sensing technology is used, such as that found in the iPhone® and iPod Touch® from Apple Inc. of Cupertino, Calif. 
     A touch-sensitive display in some embodiments of touch screen  112  is, optionally, analogous to the multi-touch sensitive touchpads described in the following U.S. patents: U.S. Pat. No. 6,323,846 (Westerman et al.), U.S. Pat. No. 6,570,557 (Westerman et al.), and/or U.S. Pat. No. 6,677,932 (Westerman), and/or U.S. Patent Publication 2002/0015024A1, each of which is hereby incorporated by reference in its entirety. However, touch screen  112  displays visual output from device  100 , whereas touch-sensitive touchpads do not provide visual output. 
     A touch-sensitive display in some embodiments of touch screen  112  is described in the following applications: (1) U.S. patent application Ser. No. 11/381,313, “Multipoint Touch Surface Controller,” filed May 2, 2006; (2) U.S. patent application Ser. No. 10/840,862, “Multipoint Touchscreen,” filed May 6, 2004; (3) U.S. patent application Ser. No. 10/903,964, “Gestures For Touch Sensitive Input Devices,” filed Jul. 30, 2004; (4) U.S. patent application Ser. No. 11/048,264, “Gestures For Touch Sensitive Input Devices,” filed Jan. 31, 2005; (5) U.S. patent application Ser. No. 11/038,590, “Mode-Based Graphical User Interfaces For Touch Sensitive Input Devices,” filed Jan. 18, 2005; (6) U.S. patent application Ser. No. 11/228,758, “Virtual Input Device Placement On A Touch Screen User Interface,” filed Sep. 16, 2005; (7) U.S. patent application Ser. No. 11/228,700, “Operation Of A Computer With A Touch Screen Interface,” filed Sep. 16, 2005; (8) U.S. patent application Ser. No. 11/228,737, “Activating Virtual Keys Of A Touch-Screen Virtual Keyboard,” filed Sep. 16, 2005; and (9) U.S. patent application Ser. No. 11/367,749, “Multi-Functional Hand-Held Device,” filed Mar. 3, 2006. All of these applications are incorporated by reference herein in their entirety. 
     Touch screen  112  optionally has a video resolution in excess of 100 dpi. In some embodiments, the touch screen has a video resolution of approximately 160 dpi. The user optionally makes contact with touch screen  112  using any suitable object or appendage, such as a stylus, a finger, and so forth. In some embodiments, the user interface is designed to work primarily with finger-based contacts and gestures, which can be less precise than stylus-based input due to the larger area of contact of a finger on the touch screen. In some embodiments, the device translates the rough finger-based input into a precise pointer/cursor position or command for performing the actions desired by the user. 
     In some embodiments, in addition to the touch screen, device  100  optionally includes a touchpad (not shown) for activating or deactivating particular functions. In some embodiments, the touchpad is a touch-sensitive area of the device that, unlike the touch screen, does not display visual output. The touchpad is, optionally, a touch-sensitive surface that is separate from touch screen  112  or an extension of the touch-sensitive surface formed by the touch screen. 
     Device  100  also includes power system  162  for powering the various components. Power system  162  optionally includes a power management system, one or more power sources (e.g., battery, alternating current (AC)), a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator (e.g., a light-emitting diode (LED)) and any other components associated with the generation, management and distribution of power in portable devices. 
     Device  100  optionally also includes one or more optical sensors  164 .  FIG. 1A  shows an optical sensor coupled to optical sensor controller  158  in I/O subsystem  106 . Optical sensor  164  optionally includes charge-coupled device (CCD) or complementary metal-oxide semiconductor (CMOS) phototransistors. Optical sensor  164  receives light from the environment, projected through one or more lenses, and converts the light to data representing an image. In conjunction with imaging module  143  (also called a camera module), optical sensor  164  optionally captures still images or video. In some embodiments, an optical sensor is located on the back of device  100 , opposite touch screen display  112  on the front of the device so that the touch screen display is enabled for use as a viewfinder for still and/or video image acquisition. In some embodiments, an optical sensor is located on the front of the device so that the user&#39;s image is, optionally, obtained for video conferencing while the user views the other video conference participants on the touch screen display. In some embodiments, the position of optical sensor  164  can be changed by the user (e.g., by rotating the lens and the sensor in the device housing) so that a single optical sensor  164  is used along with the touch screen display for both video conferencing and still and/or video image acquisition. 
     Device  100  optionally also includes one or more contact intensity sensors  165 .  FIG. 1A  shows a contact intensity sensor coupled to intensity sensor controller  159  in I/O subsystem  106 . Contact intensity sensor  165  optionally includes one or more piezoresistive strain gauges, capacitive force sensors, electric force sensors, piezoelectric force sensors, optical force sensors, capacitive touch-sensitive surfaces, or other intensity sensors (e.g., sensors used to measure the force (or pressure) of a contact on a touch-sensitive surface). Contact intensity sensor  165  receives contact intensity information (e.g., pressure information or a proxy for pressure information) from the environment. In some embodiments, at least one contact intensity sensor is collocated with, or proximate to, a touch-sensitive surface (e.g., touch-sensitive display system  112 ). In some embodiments, at least one contact intensity sensor is located on the back of device  100 , opposite touch screen display  112 , which is located on the front of device  100 . 
     Device  100  optionally also includes one or more proximity sensors  166 .  FIG. 1A  shows proximity sensor  166  coupled to peripherals interface  118 . Alternately, proximity sensor  166  is, optionally, coupled to input controller  160  in I/O subsystem  106 . Proximity sensor  166  optionally performs as described in U.S. patent application Ser. No. 11/241,839, “Proximity Detector In Handheld Device”; Ser. No. 11/240,788, “Proximity Detector In Handheld Device”; Ser. No. 11/620,702, “Using Ambient Light Sensor To Augment Proximity Sensor Output”; Ser. No. 11/586,862, “Automated Response To And Sensing Of User Activity In Portable Devices”; and Ser. No. 11/638,251, “Methods And Systems For Automatic Configuration Of Peripherals,” which are hereby incorporated by reference in their entirety. In some embodiments, the proximity sensor turns off and disables touch screen  112  when the multifunction device is placed near the user&#39;s ear (e.g., when the user is making a phone call). 
     Device  100  optionally also includes one or more tactile output generators  167 .  FIG. 1A  shows a tactile output generator coupled to haptic feedback controller  161  in I/O subsystem  106 . Tactile output generator  167  optionally includes one or more electroacoustic devices such as speakers or other audio components and/or electromechanical devices that convert energy into linear motion such as a motor, solenoid, electroactive polymer, piezoelectric actuator, electrostatic actuator, or other tactile output generating component (e.g., a component that converts electrical signals into tactile outputs on the device). Contact intensity sensor  165  receives tactile feedback generation instructions from haptic feedback module  133  and generates tactile outputs on device  100  that are capable of being sensed by a user of device  100 . In some embodiments, at least one tactile output generator is collocated with, or proximate to, a touch-sensitive surface (e.g., touch-sensitive display system  112 ) and, optionally, generates a tactile output by moving the touch-sensitive surface vertically (e.g., in/out of a surface of device  100 ) or laterally (e.g., back and forth in the same plane as a surface of device  100 ). In some embodiments, at least one tactile output generator sensor is located on the back of device  100 , opposite touch screen display  112 , which is located on the front of device  100 . 
     Device  100  optionally also includes one or more accelerometers  168 .  FIG. 1A  shows accelerometer  168  coupled to peripherals interface  118 . Alternately, accelerometer  168  is, optionally, coupled to an input controller  160  in I/O subsystem  106 . Accelerometer  168  optionally performs as described in U.S. Patent Publication No. 20050190059, “Acceleration-based Theft Detection System for Portable Electronic Devices,” and U.S. Patent Publication No. 20060017692, “Methods And Apparatuses For Operating A Portable Device Based On An Accelerometer,” both of which are incorporated by reference herein in their entirety. In some embodiments, information is displayed on the touch screen display in a portrait view or a landscape view based on an analysis of data received from the one or more accelerometers. Device  100  optionally includes, in addition to accelerometer(s)  168 , a magnetometer (not shown) and a GPS (or GLONASS or other global navigation system) receiver (not shown) for obtaining information concerning the location and orientation (e.g., portrait or landscape) of device  100 . 
     In some embodiments, the software components stored in memory  102  include operating system  126 , communication module (or set of instructions)  128 , contact/motion module (or set of instructions)  130 , graphics module (or set of instructions)  132 , text input module (or set of instructions)  134 , Global Positioning System (GPS) module (or set of instructions)  135 , and applications (or sets of instructions)  136 . Furthermore, in some embodiments, memory  102  ( FIG. 1A ) or  370  ( FIG. 3 ) stores device/global internal state  157 , as shown in  FIGS. 1A and 3 . Device/global internal state  157  includes one or more of: active application state, indicating which applications, if any, are currently active; display state, indicating what applications, views or other information occupy various regions of touch screen display  112 ; sensor state, including information obtained from the device&#39;s various sensors and input control devices  116 ; and location information concerning the device&#39;s location and/or attitude. 
     Operating system  126  (e.g., Darwin, RTXC, LINUX, UNIX, OS X, iOS, WINDOWS, or an embedded operating system such as VxWorks) includes various software components and/or drivers for controlling and managing general system tasks (e.g., memory management, storage device control, power management, etc.) and facilitates communication between various hardware and software components. 
     Communication module  128  facilitates communication with other devices over one or more external ports  124  and also includes various software components for handling data received by RF circuitry  108  and/or external port  124 . External port  124  (e.g., Universal Serial Bus (USB), FIREWIRE, etc.) is adapted for coupling directly to other devices or indirectly over a network (e.g., the Internet, wireless LAN, etc.). In some embodiments, the external port is a multi-pin (e.g., 30-pin) connector that is the same as, or similar to and/or compatible with, the 30-pin connector used on iPod® (trademark of Apple Inc.) devices. 
     Contact/motion module  130  optionally detects contact with touch screen  112  (in conjunction with display controller  156 ) and other touch-sensitive devices (e.g., a touchpad or physical click wheel). Contact/motion module  130  includes various software components for performing various operations related to detection of contact, such as determining if contact has occurred (e.g., detecting a finger-down event), determining an intensity of the contact (e.g., the force or pressure of the contact or a substitute for the force or pressure of the contact), determining if there is movement of the contact and tracking the movement across the touch-sensitive surface (e.g., detecting one or more finger-dragging events), and determining if the contact has ceased (e.g., detecting a finger-up event or a break in contact). Contact/motion module  130  receives contact data from the touch-sensitive surface. Determining movement of the point of contact, which is represented by a series of contact data, optionally includes determining speed (magnitude), velocity (magnitude and direction), and/or an acceleration (a change in magnitude and/or direction) of the point of contact. These operations are, optionally, applied to single contacts (e.g., one finger contacts) or to multiple simultaneous contacts (e.g., “multitouch”/multiple finger contacts). In some embodiments, contact/motion module  130  and display controller  156  detect contact on a touchpad. 
     In some embodiments, contact/motion module  130  uses a set of one or more intensity thresholds to determine whether an operation has been performed by a user (e.g., to determine whether a user has “clicked” on an icon). In some embodiments, at least a subset of the intensity thresholds are determined in accordance with software parameters (e.g., the intensity thresholds are not determined by the activation thresholds of particular physical actuators and can be adjusted without changing the physical hardware of device  100 ). For example, a mouse “click” threshold of a trackpad or touch screen display can be set to any of a large range of predefined threshold values without changing the trackpad or touch screen display hardware. Additionally, in some implementations, a user of the device is provided with software settings for adjusting one or more of the set of intensity thresholds (e.g., by adjusting individual intensity thresholds and/or by adjusting a plurality of intensity thresholds at once with a system-level click “intensity” parameter). 
     Contact/motion module  130  optionally detects a gesture input by a user. Different gestures on the touch-sensitive surface have different contact patterns (e.g., different motions, timings, and/or intensities of detected contacts). Thus, a gesture is, optionally, detected by detecting a particular contact pattern. For example, detecting a finger tap gesture includes detecting a finger-down event followed by detecting a finger-up (liftoff) event at the same position (or substantially the same position) as the finger-down event (e.g., at the position of an icon). As another example, detecting a finger swipe gesture on the touch-sensitive surface includes detecting a finger-down event followed by detecting one or more finger-dragging events, and subsequently followed by detecting a finger-up (liftoff) event. 
     Graphics module  132  includes various known software components for rendering and displaying graphics on touch screen  112  or other display, including components for changing the visual impact (e.g., brightness, transparency, saturation, contrast, or other visual property) of graphics that are displayed. As used herein, the term “graphics” includes any object that can be displayed to a user, including, without limitation, text, web pages, icons (such as user-interface objects including soft keys), digital images, videos, animations, and the like. 
     In some embodiments, graphics module  132  stores data representing graphics to be used. Each graphic is, optionally, assigned a corresponding code. Graphics module  132  receives, from applications etc., one or more codes specifying graphics to be displayed along with, if necessary, coordinate data and other graphic property data, and then generates screen image data to output to display controller  156 . 
     Haptic feedback module  133  includes various software components for generating instructions used by tactile output generator(s)  167  to produce tactile outputs at one or more locations on device  100  in response to user interactions with device  100 . 
     Text input module  134 , which is, optionally, a component of graphics module  132 , provides soft keyboards for entering text in various applications (e.g., contacts  137 , e-mail  140 , IM  141 , browser  147 , and any other application that needs text input). 
     GPS module  135  determines the location of the device and provides this information for use in various applications (e.g., to telephone  138  for use in location-based dialing; to camera  143  as picture/video metadata; and to applications that provide location-based services such as weather widgets, local yellow page widgets, and map/navigation widgets). 
     Applications  136  optionally include the following modules (or sets of instructions), or a subset or superset thereof:
         Contacts module  137  (sometimes called an address book or contact list);   Telephone module  138 ;   Video conference module  139 ;   E-mail client module  140 ;   Instant messaging (IM) module  141 ;   Workout support module  142 ;   Camera module  143  for still and/or video images;   Image management module  144 ;   Video player module;   Music player module;   Browser module  147 ;   Calendar module  148 ;   Widget modules  149 , which optionally include one or more of: weather widget  149 - 1 , stocks widget  149 - 2 , calculator widget  149 - 3 , alarm clock widget  149 - 4 , dictionary widget  149 - 5 , and other widgets obtained by the user, as well as user-created widgets  149 - 6 ;   Widget creator module  150  for making user-created widgets  149 - 6 ;   Search module  151 ;   Video and music player module  152 , which merges video player module and music player module;   Notes module  153 ;   Map module  154 ; and/or   Online video module  155 .       

     Examples of other applications  136  that are, optionally, stored in memory  102  include other word processing applications, other image editing applications, drawing applications, presentation applications, JAVA-enabled applications, encryption, digital rights management, voice recognition, and voice replication. 
     In conjunction with touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , and text input module  134 , contacts module  137  are, optionally, used to manage an address book or contact list (e.g., stored in application internal state  192  of contacts module  137  in memory  102  or memory  370 ), including: adding name(s) to the address book; deleting name(s) from the address book; associating telephone number(s), e-mail address(es), physical address(es) or other information with a name; associating an image with a name; categorizing and sorting names; providing telephone numbers or e-mail addresses to initiate and/or facilitate communications by telephone  138 , video conference module  139 , e-mail  140 , or IM  141 ; and so forth. 
     In conjunction with RF circuitry  108 , audio circuitry  110 , speaker  111 , microphone  113 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , and text input module  134 , telephone module  138  are, optionally, used to enter a sequence of characters corresponding to a telephone number, access one or more telephone numbers in contacts module  137 , modify a telephone number that has been entered, dial a respective telephone number, conduct a conversation, and disconnect or hang up when the conversation is completed. As noted above, the wireless communication optionally uses any of a plurality of communications standards, protocols, and technologies. 
     In conjunction with RF circuitry  108 , audio circuitry  110 , speaker  111 , microphone  113 , touch screen  112 , display controller  156 , optical sensor  164 , optical sensor controller  158 , contact/motion module  130 , graphics module  132 , text input module  134 , contacts module  137 , and telephone module  138 , video conference module  139  includes executable instructions to initiate, conduct, and terminate a video conference between a user and one or more other participants in accordance with user instructions. 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , and text input module  134 , e-mail client module  140  includes executable instructions to create, send, receive, and manage e-mail in response to user instructions. In conjunction with image management module  144 , e-mail client module  140  makes it very easy to create and send e-mails with still or video images taken with camera module  143 . 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , and text input module  134 , the instant messaging module  141  includes executable instructions to enter a sequence of characters corresponding to an instant message, to modify previously entered characters, to transmit a respective instant message (for example, using a Short Message Service (SMS) or Multimedia Message Service (MMS) protocol for telephony-based instant messages or using XMPP, SIMPLE, or IMPS for Internet-based instant messages), to receive instant messages, and to view received instant messages. In some embodiments, transmitted and/or received instant messages optionally include graphics, photos, audio files, video files and/or other attachments as are supported in an MMS and/or an Enhanced Messaging Service (EMS). As used herein, “instant messaging” refers to both telephony-based messages (e.g., messages sent using SMS or MMS) and Internet-based messages (e.g., messages sent using XMPP, SIMPLE, or IMPS). 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , text input module  134 , GPS module  135 , map module  154 , and music player module, workout support module  142  includes executable instructions to create workouts (e.g., with time, distance, and/or calorie burning goals); communicate with workout sensors (sports devices); receive workout sensor data; calibrate sensors used to monitor a workout; select and play music for a workout; and display, store, and transmit workout data. 
     In conjunction with touch screen  112 , display controller  156 , optical sensor(s)  164 , optical sensor controller  158 , contact/motion module  130 , graphics module  132 , and image management module  144 , camera module  143  includes executable instructions to capture still images or video (including a video stream) and store them into memory  102 , modify characteristics of a still image or video, or delete a still image or video from memory  102 . 
     In conjunction with touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , text input module  134 , and camera module  143 , image management module  144  includes executable instructions to arrange, modify (e.g., edit), or otherwise manipulate, label, delete, present (e.g., in a digital slide show or album), and store still and/or video images. 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , and text input module  134 , browser module  147  includes executable instructions to browse the Internet in accordance with user instructions, including searching, linking to, receiving, and displaying web pages or portions thereof, as well as attachments and other files linked to web pages. 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , text input module  134 , e-mail client module  140 , and browser module  147 , calendar module  148  includes executable instructions to create, display, modify, and store calendars and data associated with calendars (e.g., calendar entries, to-do lists, etc.) in accordance with user instructions. 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , text input module  134 , and browser module  147 , widget modules  149  are mini-applications that are, optionally, downloaded and used by a user (e.g., weather widget  149 - 1 , stocks widget  149 - 2 , calculator widget  149 - 3 , alarm clock widget  149 - 4 , and dictionary widget  149 - 5 ) or created by the user (e.g., user-created widget  149 - 6 ). In some embodiments, a widget includes an HTML (Hypertext Markup Language) file, a CSS (Cascading Style Sheets) file, and a JavaScript file. In some embodiments, a widget includes an XML (Extensible Markup Language) file and a JavaScript file (e.g., Yahoo! Widgets). 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , text input module  134 , and browser module  147 , the widget creator module  150  are, optionally, used by a user to create widgets (e.g., turning a user-specified portion of a web page into a widget). 
     In conjunction with touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , and text input module  134 , search module  151  includes executable instructions to search for text, music, sound, image, video, and/or other files in memory  102  that match one or more search criteria (e.g., one or more user-specified search terms) in accordance with user instructions. 
     In conjunction with touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , audio circuitry  110 , speaker  111 , RF circuitry  108 , and browser module  147 , video and music player module  152  includes executable instructions that allow the user to download and play back recorded music and other sound files stored in one or more file formats, such as MP3 or AAC files, and executable instructions to display, present, or otherwise play back videos (e.g., on touch screen  112  or on an external, connected display via external port  124 ). In some embodiments, device  100  optionally includes the functionality of an MP3 player, such as an iPod (trademark of Apple Inc.). 
     In conjunction with touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , and text input module  134 , notes module  153  includes executable instructions to create and manage notes, to-do lists, and the like in accordance with user instructions. 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , text input module  134 , GPS module  135 , and browser module  147 , map module  154  are, optionally, used to receive, display, modify, and store maps and data associated with maps (e.g., driving directions, data on stores and other points of interest at or near a particular location, and other location-based data) in accordance with user instructions. 
     In conjunction with touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , audio circuitry  110 , speaker  111 , RF circuitry  108 , text input module  134 , e-mail client module  140 , and browser module  147 , online video module  155  includes instructions that allow the user to access, browse, receive (e.g., by streaming and/or download), play back (e.g., on the touch screen or on an external, connected display via external port  124 ), send an e-mail with a link to a particular online video, and otherwise manage online videos in one or more file formats, such as H.264. In some embodiments, instant messaging module  141 , rather than e-mail client module  140 , is used to send a link to a particular online video. Additional description of the online video application can be found in U.S. Provisional Patent Application No. 60/936,562, “Portable Multifunction Device, Method, and Graphical User Interface for Playing Online Videos,” filed Jun. 20, 2007, and U.S. patent application Ser. No. 11/968,067, “Portable Multifunction Device, Method, and Graphical User Interface for Playing Online Videos,” filed Dec. 31, 2007, the contents of which are hereby incorporated by reference in their entirety. 
     Each of the above-identified modules and applications corresponds to a set of executable instructions for performing one or more functions described above and the methods described in this application (e.g., the computer-implemented methods and other information processing methods described herein). These modules (e.g., sets of instructions) need not be implemented as separate software programs, procedures, or modules, and thus various subsets of these modules are, optionally, combined or otherwise rearranged in various embodiments. For example, video player module is, optionally, combined with music player module into a single module (e.g., video and music player module  152 ,  FIG. 1A ). In some embodiments, memory  102  optionally stores a subset of the modules and data structures identified above. Furthermore, memory  102  optionally stores additional modules and data structures not described above. 
     In some embodiments, device  100  is a device where operation of a predefined set of functions on the device is performed exclusively through a touch screen and/or a touchpad. By using a touch screen and/or a touchpad as the primary input control device for operation of device  100 , the number of physical input control devices (such as push buttons, dials, and the like) on device  100  is, optionally, reduced. 
     The predefined set of functions that are performed exclusively through a touch screen and/or a touchpad optionally include navigation between user interfaces. In some embodiments, the touchpad, when touched by the user, navigates device  100  to a main, home, or root menu from any user interface that is displayed on device  100 . In such embodiments, a “menu button” is implemented using a touchpad. In some other embodiments, the menu button is a physical push button or other physical input control device instead of a touchpad. 
       FIG. 1B  is a block diagram illustrating exemplary components for event handling in accordance with some embodiments. In some embodiments, memory  102  ( FIG. 1A ) or  370  ( FIG. 3 ) includes event sorter  170  (e.g., in operating system  126 ) and a respective application  136 - 1  (e.g., any of the aforementioned applications  137 - 151 ,  155 ,  380 - 390 ). 
     Event sorter  170  receives event information and determines the application  136 - 1  and application view  191  of application  136 - 1  to which to deliver the event information. Event sorter  170  includes event monitor  171  and event dispatcher module  174 . In some embodiments, application  136 - 1  includes application internal state  192 , which indicates the current application view(s) displayed on touch-sensitive display  112  when the application is active or executing. In some embodiments, device/global internal state  157  is used by event sorter  170  to determine which application(s) is (are) currently active, and application internal state  192  is used by event sorter  170  to determine application views  191  to which to deliver event information. 
     In some embodiments, application internal state  192  includes additional information, such as one or more of: resume information to be used when application  136 - 1  resumes execution, user interface state information that indicates information being displayed or that is ready for display by application  136 - 1 , a state queue for enabling the user to go back to a prior state or view of application  136 - 1 , and a redo/undo queue of previous actions taken by the user. 
     Event monitor  171  receives event information from peripherals interface  118 . Event information includes information about a sub-event (e.g., a user touch on touch-sensitive display  112 , as part of a multi-touch gesture). Peripherals interface  118  transmits information it receives from I/O subsystem  106  or a sensor, such as proximity sensor  166 , accelerometer(s)  168 , and/or microphone  113  (through audio circuitry  110 ). Information that peripherals interface  118  receives from I/O subsystem  106  includes information from touch-sensitive display  112  or a touch-sensitive surface. 
     In some embodiments, event monitor  171  sends requests to the peripherals interface  118  at predetermined intervals. In response, peripherals interface  118  transmits event information. In other embodiments, peripherals interface  118  transmits event information only when there is a significant event (e.g., receiving an input above a predetermined noise threshold and/or for more than a predetermined duration). 
     In some embodiments, event sorter  170  also includes a hit view determination module  172  and/or an active event recognizer determination module  173 . 
     Hit view determination module  172  provides software procedures for determining where a sub-event has taken place within one or more views when touch-sensitive display  112  displays more than one view. Views are made up of controls and other elements that a user can see on the display. 
     Another aspect of the user interface associated with an application is a set of views, sometimes herein called application views or user interface windows, in which information is displayed and touch-based gestures occur. The application views (of a respective application) in which a touch is detected optionally correspond to programmatic levels within a programmatic or view hierarchy of the application. For example, the lowest level view in which a touch is detected is, optionally, called the hit view, and the set of events that are recognized as proper inputs are, optionally, determined based, at least in part, on the hit view of the initial touch that begins a touch-based gesture. 
     Hit view determination module  172  receives information related to sub-events of a touch-based gesture. When an application has multiple views organized in a hierarchy, hit view determination module  172  identifies a hit view as the lowest view in the hierarchy which should handle the sub-event. In most circumstances, the hit view is the lowest level view in which an initiating sub-event occurs (e.g., the first sub-event in the sequence of sub-events that form an event or potential event). Once the hit view is identified by the hit view determination module  172 , the hit view typically receives all sub-events related to the same touch or input source for which it was identified as the hit view. 
     Active event recognizer determination module  173  determines which view or views within a view hierarchy should receive a particular sequence of sub-events. In some embodiments, active event recognizer determination module  173  determines that only the hit view should receive a particular sequence of sub-events. In other embodiments, active event recognizer determination module  173  determines that all views that include the physical location of a sub-event are actively involved views, and therefore determines that all actively involved views should receive a particular sequence of sub-events. In other embodiments, even if touch sub-events were entirely confined to the area associated with one particular view, views higher in the hierarchy would still remain as actively involved views. 
     Event dispatcher module  174  dispatches the event information to an event recognizer (e.g., event recognizer  180 ). In embodiments including active event recognizer determination module  173 , event dispatcher module  174  delivers the event information to an event recognizer determined by active event recognizer determination module  173 . In some embodiments, event dispatcher module  174  stores in an event queue the event information, which is retrieved by a respective event receiver  182 . 
     In some embodiments, operating system  126  includes event sorter  170 . Alternatively, application  136 - 1  includes event sorter  170 . In yet other embodiments, event sorter  170  is a stand-alone module, or a part of another module stored in memory  102 , such as contact/motion module  130 . 
     In some embodiments, application  136 - 1  includes a plurality of event handlers  190  and one or more application views  191 , each of which includes instructions for handling touch events that occur within a respective view of the application&#39;s user interface. Each application view  191  of the application  136 - 1  includes one or more event recognizers  180 . Typically, a respective application view  191  includes a plurality of event recognizers  180 . In other embodiments, one or more of event recognizers  180  are part of a separate module, such as a user interface kit (not shown) or a higher level object from which application  136 - 1  inherits methods and other properties. In some embodiments, a respective event handler  190  includes one or more of: data updater  176 , object updater  177 , GUI updater  178 , and/or event data  179  received from event sorter  170 . Event handler  190  optionally utilizes or calls data updater  176 , object updater  177 , or GUI updater  178  to update the application internal state  192 . Alternatively, one or more of the application views  191  include one or more respective event handlers  190 . Also, in some embodiments, one or more of data updater  176 , object updater  177 , and GUI updater  178  are included in a respective application view  191 . 
     A respective event recognizer  180  receives event information (e.g., event data  179 ) from event sorter  170  and identifies an event from the event information. Event recognizer  180  includes event receiver  182  and event comparator  184 . In some embodiments, event recognizer  180  also includes at least a subset of: metadata  183 , and event delivery instructions  188  (which may include sub-event delivery instructions). 
     Event receiver  182  receives event information from event sorter  170 . The event information includes information about a sub-event, for example, a touch or a touch movement. Depending on the sub-event, the event information also includes additional information, such as location of the sub-event. When the sub-event concerns motion of a touch, the event information optionally also includes speed and direction of the sub-event. In some embodiments, events include rotation of the device from one orientation to another (e.g., from a portrait orientation to a landscape orientation, or vice versa), and the event information includes corresponding information about the current orientation (also called device attitude) of the device. 
     Event comparator  184  compares the event information to predefined event or sub-event definitions and, based on the comparison, determines an event or sub-event, or determines or updates the state of an event or sub-event. In some embodiments, event comparator  184  includes event definitions  186 . Event definitions  186  contain definitions of events (e.g., predefined sequences of sub-events), for example, event  1  ( 187 - 1 ), event  2  ( 187 - 2 ), and others. In some embodiments, sub-events in an event ( 187 ) include, for example, touch begin, touch end, touch movement, touch cancellation, and multiple touching. In one example, the definition for event  1  ( 187 - 1 ) is a double tap on a displayed object. The double tap, for example, comprises a first touch (touch begin) on the displayed object for a predetermined phase, a first liftoff (touch end) for a predetermined phase, a second touch (touch begin) on the displayed object for a predetermined phase, and a second liftoff (touch end) for a predetermined phase. In another example, the definition for event  2  ( 187 - 2 ) is a dragging on a displayed object. The dragging, for example, comprises a touch (or contact) on the displayed object for a predetermined phase, a movement of the touch across touch-sensitive display  112 , and liftoff of the touch (touch end). In some embodiments, the event also includes information for one or more associated event handlers  190 . 
     In some embodiments, event definition  187  includes a definition of an event for a respective user-interface object. In some embodiments, event comparator  184  performs a hit test to determine which user-interface object is associated with a sub-event. For example, in an application view in which three user-interface objects are displayed on touch-sensitive display  112 , when a touch is detected on touch-sensitive display  112 , event comparator  184  performs a hit test to determine which of the three user-interface objects is associated with the touch (sub-event). If each displayed object is associated with a respective event handler  190 , the event comparator uses the result of the hit test to determine which event handler  190  should be activated. For example, event comparator  184  selects an event handler associated with the sub-event and the object triggering the hit test. 
     In some embodiments, the definition for a respective event ( 187 ) also includes delayed actions that delay delivery of the event information until after it has been determined whether the sequence of sub-events does or does not correspond to the event recognizer&#39;s event type. 
     When a respective event recognizer  180  determines that the series of sub-events do not match any of the events in event definitions  186 , the respective event recognizer  180  enters an event impossible, event failed, or event ended state, after which it disregards subsequent sub-events of the touch-based gesture. In this situation, other event recognizers, if any, that remain active for the hit view continue to track and process sub-events of an ongoing touch-based gesture. 
     In some embodiments, a respective event recognizer  180  includes metadata  183  with configurable properties, flags, and/or lists that indicate how the event delivery system should perform sub-event delivery to actively involved event recognizers. In some embodiments, metadata  183  includes configurable properties, flags, and/or lists that indicate how event recognizers interact, or are enabled to interact, with one another. In some embodiments, metadata  183  includes configurable properties, flags, and/or lists that indicate whether sub-events are delivered to varying levels in the view or programmatic hierarchy. 
     In some embodiments, a respective event recognizer  180  activates event handler  190  associated with an event when one or more particular sub-events of an event are recognized. In some embodiments, a respective event recognizer  180  delivers event information associated with the event to event handler  190 . Activating an event handler  190  is distinct from sending (and deferred sending) sub-events to a respective hit view. In some embodiments, event recognizer  180  throws a flag associated with the recognized event, and event handler  190  associated with the flag catches the flag and performs a predefined process. 
     In some embodiments, event delivery instructions  188  include sub-event delivery instructions that deliver event information about a sub-event without activating an event handler. Instead, the sub-event delivery instructions deliver event information to event handlers associated with the series of sub-events or to actively involved views. Event handlers associated with the series of sub-events or with actively involved views receive the event information and perform a predetermined process. 
     In some embodiments, data updater  176  creates and updates data used in application  136 - 1 . For example, data updater  176  updates the telephone number used in contacts module  137 , or stores a video file used in video player module. In some embodiments, object updater  177  creates and updates objects used in application  136 - 1 . For example, object updater  177  creates a new user-interface object or updates the position of a user-interface object. GUI updater  178  updates the GUI. For example, GUI updater  178  prepares display information and sends it to graphics module  132  for display on a touch-sensitive display. 
     In some embodiments, event handler(s)  190  includes or has access to data updater  176 , object updater  177 , and GUI updater  178 . In some embodiments, data updater  176 , object updater  177 , and GUI updater  178  are included in a single module of a respective application  136 - 1  or application view  191 . In other embodiments, they are included in two or more software modules. 
     It shall be understood that the foregoing discussion regarding event handling of user touches on touch-sensitive displays also applies to other forms of user inputs to operate multifunction devices  100  with input devices, not all of which are initiated on touch screens. For example, mouse movement and mouse button presses, optionally coordinated with single or multiple keyboard presses or holds; contact movements such as taps, drags, scrolls, etc. on touchpads; pen stylus inputs; movement of the device; oral instructions; detected eye movements; biometric inputs; and/or any combination thereof are optionally utilized as inputs corresponding to sub-events which define an event to be recognized. 
       FIG. 2  illustrates a portable multifunction device  100  having a touch screen  112  in accordance with some embodiments. The touch screen optionally displays one or more graphics within user interface (UI)  200 . In this embodiment, as well as others described below, a user is enabled to select one or more of the graphics by making a gesture on the graphics, for example, with one or more fingers  202  (not drawn to scale in the figure) or one or more styluses  203  (not drawn to scale in the figure). In some embodiments, selection of one or more graphics occurs when the user breaks contact with the one or more graphics. In some embodiments, the gesture optionally includes one or more taps, one or more swipes (from left to right, right to left, upward and/or downward), and/or a rolling of a finger (from right to left, left to right, upward and/or downward) that has made contact with device  100 . In some implementations or circumstances, inadvertent contact with a graphic does not select the graphic. For example, a swipe gesture that sweeps over an application icon optionally does not select the corresponding application when the gesture corresponding to selection is a tap. 
     Device  100  optionally also include one or more physical buttons, such as “home” or menu button  204 . As described previously, menu button  204  is, optionally, used to navigate to any application  136  in a set of applications that are, optionally, executed on device  100 . Alternatively, in some embodiments, the menu button is implemented as a soft key in a GUI displayed on touch screen  112 . 
     In some embodiments, device  100  includes touch screen  112 , menu button  204 , push button  206  for powering the device on/off and locking the device, volume adjustment button(s)  208 , subscriber identity module (SIM) card slot  210 , headset jack  212 , and docking/charging external port  124 . Push button  206  is, optionally, used to turn the power on/off on the device by depressing the button and holding the button in the depressed state for a predefined time interval; to lock the device by depressing the button and releasing the button before the predefined time interval has elapsed; and/or to unlock the device or initiate an unlock process. In an alternative embodiment, device  100  also accepts verbal input for activation or deactivation of some functions through microphone  113 . Device  100  also, optionally, includes one or more contact intensity sensors  165  for detecting intensity of contacts on touch screen  112  and/or one or more tactile output generators  167  for generating tactile outputs for a user of device  100 . 
       FIG. 3  is a block diagram of an exemplary multifunction device with a display and a touch-sensitive surface in accordance with some embodiments. Device  300  need not be portable. In some embodiments, device  300  is a laptop computer, a desktop computer, a tablet computer, a multimedia player device, a navigation device, an educational device (such as a child&#39;s learning toy), a gaming system, or a control device (e.g., a home or industrial controller). Device  300  typically includes one or more processing units (CPUs)  310 , one or more network or other communications interfaces  360 , memory  370 , and one or more communication buses  320  for interconnecting these components. Communication buses  320  optionally include circuitry (sometimes called a chipset) that interconnects and controls communications between system components. Device  300  includes input/output (I/O) interface  330  comprising display  340 , which is typically a touch screen display. I/O interface  330  also optionally includes a keyboard and/or mouse (or other pointing device)  350  and touchpad  355 , tactile output generator  357  for generating tactile outputs on device  300  (e.g., similar to tactile output generator(s)  167  described above with reference to  FIG. 1A ), sensors  359  (e.g., optical, acceleration, proximity, touch-sensitive, and/or contact intensity sensors similar to contact intensity sensor(s)  165  described above with reference to  FIG. 1A ). Memory  370  includes high-speed random access memory, such as DRAM, SRAM, DDR RAM, or other random access solid state memory devices; and optionally includes non-volatile memory, such as one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, or other non-volatile solid state storage devices. Memory  370  optionally includes one or more storage devices remotely located from CPU(s)  310 . In some embodiments, memory  370  stores programs, modules, and data structures analogous to the programs, modules, and data structures stored in memory  102  of portable multifunction device  100  ( FIG. 1A ), or a subset thereof. Furthermore, memory  370  optionally stores additional programs, modules, and data structures not present in memory  102  of portable multifunction device  100 . For example, memory  370  of device  300  optionally stores drawing module  380 , presentation module  382 , word processing module  384 , website creation module  386 , disk authoring module  388 , and/or spreadsheet module  390 , while memory  102  of portable multifunction device  100  ( FIG. 1A ) optionally does not store these modules. 
     Each of the above-identified elements in  FIG. 3  are, optionally, stored in one or more of the previously mentioned memory devices. Each of the above-identified modules corresponds to a set of instructions for performing a function described above. The above-identified modules or programs (e.g., sets of instructions) need not be implemented as separate software programs, procedures, or modules, and thus various subsets of these modules are, optionally, combined or otherwise rearranged in various embodiments. In some embodiments, memory  370  optionally stores a subset of the modules and data structures identified above. Furthermore, memory  370  optionally stores additional modules and data structures not described above. 
     Attention is now directed towards embodiments of user interfaces that is, optionally, implemented on, for example, portable multifunction device  100 . 
       FIG. 4A  illustrates an exemplary user interface for a menu of applications on portable multifunction device  100  in accordance with some embodiments. Similar user interfaces are, optionally, implemented on device  300 . In some embodiments, user interface  400  includes the following elements, or a subset or superset thereof:
         Signal strength indicator(s)  402  for wireless communication(s), such as cellular and Wi-Fi signals;   Time  404 ;   Bluetooth indicator  405 ;   Battery status indicator  406 ;   Tray  408  with icons for frequently used applications, such as:   Icon  416  for telephone module  138 , labeled “Phone,” which optionally includes an indicator  414  of the number of missed calls or voicemail messages;   Icon  418  for e-mail client module  140 , labeled “Mail,” which optionally includes an indicator  410  of the number of unread e-mails;   Icon  420  for browser module  147 , labeled “Browser;” and   Icon  422  for video and music player module  152 , also referred to as iPod (trademark of Apple Inc.) module  152 , labeled “iPod;” and   Icons for other applications, such as:   Icon  424  for IM module  141 , labeled “Messages;”   Icon  426  for calendar module  148 , labeled “Calendar;”   Icon  428  for image management module  144 , labeled “Photos;”   Icon  430  for camera module  143 , labeled “Camera;”   Icon  432  for online video module  155 , labeled “Online Video;”   Icon  434  for stocks widget  149 - 2 , labeled “Stocks;”   Icon  436  for map module  154 , labeled “Maps;”   Icon  438  for weather widget  149 - 1 , labeled “Weather;”   Icon  440  for alarm clock widget  149 - 4 , labeled “Clock;”   Icon  442  for workout support module  142 , labeled “Workout Support;”   Icon  444  for notes module  153 , labeled “Notes;” and   Icon  446  for a settings application or module, labeled “Settings,” which provides access to settings for device  100  and its various applications  136 .       

     It should be noted that the icon labels illustrated in  FIG. 4A  are merely exemplary. For example, icon  422  for video and music player module  152  are labeled “Music” or “Music Player.” Other labels are, optionally, used for various application icons. In some embodiments, a label for a respective application icon includes a name of an application corresponding to the respective application icon. In some embodiments, a label for a particular application icon is distinct from a name of an application corresponding to the particular application icon. 
       FIG. 4B  illustrates an exemplary user interface on a device (e.g., device  300 ,  FIG. 3 ) with a touch-sensitive surface  451  (e.g., a tablet or touchpad  355 ,  FIG. 3 ) that is separate from the display  450  (e.g., touch screen display  112 ). Device  300  also, optionally, includes one or more contact intensity sensors (e.g., one or more of sensors  359 ) for detecting intensity of contacts on touch-sensitive surface  451  and/or one or more tactile output generators  357  for generating tactile outputs for a user of device  300 . 
     Although some of the examples which follow will be given with reference to inputs on touch screen display  112  (where the touch-sensitive surface and the display are combined), in some embodiments, the device detects inputs on a touch-sensitive surface that is separate from the display, as shown in  FIG. 4B . In some embodiments, the touch-sensitive surface (e.g.,  451  in  FIG. 4B ) has a primary axis (e.g.,  452  in  FIG. 4B ) that corresponds to a primary axis (e.g.,  453  in  FIG. 4B ) on the display (e.g.,  450 ). In accordance with these embodiments, the device detects contacts (e.g.,  460  and  462  in  FIG. 4B ) with the touch-sensitive surface  451  at locations that correspond to respective locations on the display (e.g., in  FIG. 4B, 460  corresponds to  468  and  462  corresponds to  470 ). In this way, user inputs (e.g., contacts  460  and  462 , and movements thereof) detected by the device on the touch-sensitive surface (e.g.,  451  in  FIG. 4B ) are used by the device to manipulate the user interface on the display (e.g.,  450  in  FIG. 4B ) of the multifunction device when the touch-sensitive surface is separate from the display. It should be understood that similar methods are, optionally, used for other user interfaces described herein. 
     Additionally, while the following examples are given primarily with reference to finger inputs (e.g., finger contacts, finger tap gestures, finger swipe gestures), it should be understood that, in some embodiments, one or more of the finger inputs are replaced with input from another input device (e.g., a mouse-based input or stylus input). For example, a swipe gesture is, optionally, replaced with a mouse click (e.g., instead of a contact) followed by movement of the cursor along the path of the swipe (e.g., instead of movement of the contact). As another example, a tap gesture is, optionally, replaced with a mouse click while the cursor is located over the location of the tap gesture (e.g., instead of detection of the contact followed by ceasing to detect the contact). Similarly, when multiple user inputs are simultaneously detected, it should be understood that multiple computer mice are, optionally, used simultaneously, or a mouse and finger contacts are, optionally, used simultaneously. 
       FIG. 5A  illustrates exemplary personal electronic device  500 . Device  500  includes body  502 . In some embodiments, device  500  can include some or all of the features described with respect to devices  100  and  300  (e.g.,  FIGS. 1A-4B ). In some embodiments, device  500  has touch-sensitive display screen  504 , hereafter touch screen  504 . Alternatively, or in addition to touch screen  504 , device  500  has a display and a touch-sensitive surface. As with devices  100  and  300 , in some embodiments, touch screen  504  (or the touch-sensitive surface) optionally includes one or more intensity sensors for detecting intensity of contacts (e.g., touches) being applied. The one or more intensity sensors of touch screen  504  (or the touch-sensitive surface) can provide output data that represents the intensity of touches. The user interface of device  500  can respond to touches based on their intensity, meaning that touches of different intensities can invoke different user interface operations on device  500 . 
     Exemplary techniques for detecting and processing touch intensity are found, for example, in related applications: International Patent Application Serial No. PCT/US2013/040061, titled “Device, Method, and Graphical User Interface for Displaying User Interface Objects Corresponding to an Application,” filed May 8, 2013, published as WIPO Publication No. WO/2013/169849, and International Patent Application Serial No. PCT/US2013/069483, titled “Device, Method, and Graphical User Interface for Transitioning Between Touch Input to Display Output Relationships,” filed Nov. 11, 2013, published as WIPO Publication No. WO/2014/105276, each of which is hereby incorporated by reference in their entirety. 
     In some embodiments, device  500  has one or more input mechanisms  506  and  508 . Input mechanisms  506  and  508 , if included, can be physical. Examples of physical input mechanisms include push buttons and rotatable mechanisms. In some embodiments, device  500  has one or more attachment mechanisms. Such attachment mechanisms, if included, can permit attachment of device  500  with, for example, hats, eyewear, earrings, necklaces, shirts, jackets, bracelets, watch straps, chains, trousers, belts, shoes, purses, backpacks, and so forth. These attachment mechanisms may permit device  500  to be worn by a user. 
       FIG. 5B  depicts exemplary personal electronic device  500 . In some embodiments, device  500  can include some or all of the components described with respect to  FIGS. 1A, 1B , and  3 . Device  500  has bus  512  that operatively couples I/O section  514  with one or more computer processors  516  and memory  518 . I/O section  514  can be connected to display  504 , which can have touch-sensitive component  522  and, optionally, intensity sensor  524  (e.g., contact intensity sensor). In addition, I/O section  514  can be connected with communication unit  530  for receiving application and operating system data, using Wi-Fi, Bluetooth, near field communication (NFC), cellular, and/or other wireless communication techniques. Device  500  can include input mechanisms  506  and/or  508 . Input mechanism  506  is, optionally, a rotatable input device or a depressible and a rotatable input device, for example. Input mechanism  508  is, optionally, a button, in some examples. 
     Input mechanism  508  is, optionally, a microphone, in some examples. Personal electronic device  500  optionally includes various sensors, such as GPS sensor  532 , accelerometer  534 , directional sensor  540  (e.g., compass), gyroscope  536 , motion sensor  538 , and/or a combination thereof, all of which can be operatively connected to I/O section  514 . 
     Memory  518  of personal electronic device  500  can be a non-transitory computer-readable storage medium, for storing computer-executable instructions, which, when executed by one or more computer processors  516 , for example, can cause the computer processors to perform the techniques described above, including processes  700  ( FIG. 7 ),  1000  ( FIG. 10 ),  1200  ( FIG. 12 ),  1400  ( FIG. 14 ),  1600  ( FIG. 16 ),  1800  ( FIG. 18 ),  2000  ( FIG. 20 ), and  2200  ( FIG. 22 ). The computer-executable instructions can also be stored and/or transported within any non-transitory computer-readable storage medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For purposes of this document, a “non-transitory computer-readable storage medium” can be any medium that can tangibly contain or store computer-executable instructions for use by or in connection with the instruction execution system, apparatus, or device. The non-transitory computer-readable storage medium can include, but is not limited to, magnetic, optical, and/or semiconductor storages. Examples of such storage include magnetic disks, optical discs based on CD, DVD, or Blu-ray technologies, as well as persistent solid-state memory such as flash, solid-state drives, and the like. Personal electronic device  500  is not limited to the components and configuration of  FIG. 5B , but can include other or additional components in multiple configurations. 
     As used here, the term “affordance” refers to a user-interactive graphical user interface object that is, optionally, displayed on the display screen of devices  100 ,  300 , and/or  500  ( FIGS. 1, 3, and 5 ). For example, an image (e.g., icon), a button, and text (e.g., hyperlink) each optionally constitute an affordance. 
     As used herein, the term “focus selector” refers to an input element that indicates a current part of a user interface with which a user is interacting. In some implementations that include a cursor or other location marker, the cursor acts as a “focus selector” so that when an input (e.g., a press input) is detected on a touch-sensitive surface (e.g., touchpad  355  in  FIG. 3  or touch-sensitive surface  451  in  FIG. 4B ) while the cursor is over a particular user interface element (e.g., a button, window, slider or other user interface element), the particular user interface element is adjusted in accordance with the detected input. In some implementations that include a touch screen display (e.g., touch-sensitive display system  112  in  FIG. 1A  or touch screen  112  in  FIG. 4A ) that enables direct interaction with user interface elements on the touch screen display, a detected contact on the touch screen acts as a “focus selector” so that when an input (e.g., a press input by the contact) is detected on the touch screen display at a location of a particular user interface element (e.g., a button, window, slider, or other user interface element), the particular user interface element is adjusted in accordance with the detected input. In some implementations, focus is moved from one region of a user interface to another region of the user interface without corresponding movement of a cursor or movement of a contact on a touch screen display (e.g., by using a tab key or arrow keys to move focus from one button to another button); in these implementations, the focus selector moves in accordance with movement of focus between different regions of the user interface. Without regard to the specific form taken by the focus selector, the focus selector is generally the user interface element (or contact on a touch screen display) that is controlled by the user so as to communicate the user&#39;s intended interaction with the user interface (e.g., by indicating, to the device, the element of the user interface with which the user is intending to interact). For example, the location of a focus selector (e.g., a cursor, a contact, or a selection box) over a respective button while a press input is detected on the touch-sensitive surface (e.g., a touchpad or touch screen) will indicate that the user is intending to activate the respective button (as opposed to other user interface elements shown on a display of the device). 
     As used in the specification and claims, the term “characteristic intensity” of a contact refers to a characteristic of the contact based on one or more intensities of the contact. In some embodiments, the characteristic intensity is based on multiple intensity samples. The characteristic intensity is, optionally, based on a predefined number of intensity samples, or a set of intensity samples collected during a predetermined time period (e.g., 0.05, 0.1, 0.2, 0.5, 1, 2, 5, 10 seconds) relative to a predefined event (e.g., after detecting the contact, prior to detecting liftoff of the contact, before or after detecting a start of movement of the contact, prior to detecting an end of the contact, before or after detecting an increase in intensity of the contact, and/or before or after detecting a decrease in intensity of the contact). A characteristic intensity of a contact is, optionally based on one or more of: a maximum value of the intensities of the contact, a mean value of the intensities of the contact, an average value of the intensities of the contact, a top 10 percentile value of the intensities of the contact, a value at the half maximum of the intensities of the contact, a value at the 90 percent maximum of the intensities of the contact, or the like. In some embodiments, the duration of the contact is used in determining the characteristic intensity (e.g., when the characteristic intensity is an average of the intensity of the contact over time). In some embodiments, the characteristic intensity is compared to a set of one or more intensity thresholds to determine whether an operation has been performed by a user. For example, the set of one or more intensity thresholds optionally includes a first intensity threshold and a second intensity threshold. In this example, a contact with a characteristic intensity that does not exceed the first threshold results in a first operation, a contact with a characteristic intensity that exceeds the first intensity threshold and does not exceed the second intensity threshold results in a second operation, and a contact with a characteristic intensity that exceeds the second threshold results in a third operation. In some embodiments, a comparison between the characteristic intensity and one or more thresholds is used to determine whether or not to perform one or more operations (e.g., whether to perform a respective operation or forgo performing the respective operation) rather than being used to determine whether to perform a first operation or a second operation. 
       FIG. 5C  illustrates detecting a plurality of contacts  552 A- 552 E on touch-sensitive display screen  504  with a plurality of intensity sensors  524 A- 524 D.  FIG. 5C  additionally includes intensity diagrams that show the current intensity measurements of the intensity sensors  524 A- 524 D relative to units of intensity. In this example, the intensity measurements of intensity sensors  524 A and  524 D are each 9 units of intensity, and the intensity measurements of intensity sensors  524 B and  524 C are each 7 units of intensity. In some implementations, an aggregate intensity is the sum of the intensity measurements of the plurality of intensity sensors  524 A- 524 D, which in this example is 32 intensity units. In some embodiments, each contact is assigned a respective intensity that is a portion of the aggregate intensity.  FIG. 5D  illustrates assigning the aggregate intensity to contacts  552 A- 552 E based on their distance from the center of force  554 . In this example, each of contacts  552 A,  552 B and  552 E are assigned an intensity of contact of 8 intensity units of the aggregate intensity, and each of contacts  552 C and  552 D are assigned an intensity of contact of 4 intensity units of the aggregate intensity. More generally, in some implementations, each contact j is assigned a respective intensity Ij that is a portion of the aggregate intensity, A, in accordance with a predefined mathematical function, Ij=A·(Dj/ΣDi), where Dj is the distance of the respective contact j to the center of force, and EDi is the sum of the distances of all the respective contacts (e.g., i=1 to last) to the center of force. The operations described with reference to  FIGS. 5C-5D  can be performed using an electronic device similar or identical to device  100 ,  300 , or  500 . In some embodiments, a characteristic intensity of a contact is based on one or more intensities of the contact. In some embodiments, the intensity sensors are used to determine a single characteristic intensity (e.g., a single characteristic intensity of a single contact). It should be noted that the intensity diagrams are not part of a displayed user interface, but are included in  FIGS. 5C-5D  to aid the reader. 
     In some embodiments, a portion of a gesture is identified for purposes of determining a characteristic intensity. For example, a touch-sensitive surface optionally receives a continuous swipe contact transitioning from a start location and reaching an end location, at which point the intensity of the contact increases. In this example, the characteristic intensity of the contact at the end location is, optionally, based on only a portion of the continuous swipe contact, and not the entire swipe contact (e.g., only the portion of the swipe contact at the end location). In some embodiments, a smoothing algorithm is, optionally, applied to the intensities of the swipe contact prior to determining the characteristic intensity of the contact. For example, the smoothing algorithm optionally includes one or more of: an unweighted sliding-average smoothing algorithm, a triangular smoothing algorithm, a median filter smoothing algorithm, and/or an exponential smoothing algorithm. In some circumstances, these smoothing algorithms eliminate narrow spikes or dips in the intensities of the swipe contact for purposes of determining a characteristic intensity. 
     The intensity of a contact on the touch-sensitive surface is, optionally, characterized relative to one or more intensity thresholds, such as a contact-detection intensity threshold, a light press intensity threshold, a deep press intensity threshold, and/or one or more other intensity thresholds. In some embodiments, the light press intensity threshold corresponds to an intensity at which the device will perform operations typically associated with clicking a button of a physical mouse or a trackpad. In some embodiments, the deep press intensity threshold corresponds to an intensity at which the device will perform operations that are different from operations typically associated with clicking a button of a physical mouse or a trackpad. In some embodiments, when a contact is detected with a characteristic intensity below the light press intensity threshold (e.g., and above a nominal contact-detection intensity threshold below which the contact is no longer detected), the device will move a focus selector in accordance with movement of the contact on the touch-sensitive surface without performing an operation associated with the light press intensity threshold or the deep press intensity threshold. Generally, unless otherwise stated, these intensity thresholds are consistent between different sets of user interface figures. 
     An increase of characteristic intensity of the contact from an intensity below the light press intensity threshold to an intensity between the light press intensity threshold and the deep press intensity threshold is sometimes referred to as a “light press” input. An increase of characteristic intensity of the contact from an intensity below the deep press intensity threshold to an intensity above the deep press intensity threshold is sometimes referred to as a “deep press” input. An increase of characteristic intensity of the contact from an intensity below the contact-detection intensity threshold to an intensity between the contact-detection intensity threshold and the light press intensity threshold is sometimes referred to as detecting the contact on the touch-surface. A decrease of characteristic intensity of the contact from an intensity above the contact-detection intensity threshold to an intensity below the contact-detection intensity threshold is sometimes referred to as detecting liftoff of the contact from the touch-surface. In some embodiments, the contact-detection intensity threshold is zero. In some embodiments, the contact-detection intensity threshold is greater than zero. 
     In some embodiments described herein, one or more operations are performed in response to detecting a gesture that includes a respective press input or in response to detecting the respective press input performed with a respective contact (or a plurality of contacts), where the respective press input is detected based at least in part on detecting an increase in intensity of the contact (or plurality of contacts) above a press-input intensity threshold. In some embodiments, the respective operation is performed in response to detecting the increase in intensity of the respective contact above the press-input intensity threshold (e.g., a “down stroke” of the respective press input). In some embodiments, the press input includes an increase in intensity of the respective contact above the press-input intensity threshold and a subsequent decrease in intensity of the contact below the press-input intensity threshold, and the respective operation is performed in response to detecting the subsequent decrease in intensity of the respective contact below the press-input threshold (e.g., an “up stroke” of the respective press input). 
       FIGS. 5E-5H  illustrate detection of a gesture that includes a press input that corresponds to an increase in intensity of a contact  562  from an intensity below a light press intensity threshold (e.g., “IT L ”) in  FIG. 5E , to an intensity above a deep press intensity threshold (e.g., “IT D ”) in  FIG. 5H . The gesture performed with contact  562  is detected on touch-sensitive surface  560  while cursor  576  is displayed over application icon  572 B corresponding to App  2 , on a displayed user interface  570  that includes application icons  572 A- 572 D displayed in predefined region  574 . In some embodiments, the gesture is detected on touch-sensitive display  504 . The intensity sensors detect the intensity of contacts on touch-sensitive surface  560 . The device determines that the intensity of contact  562  peaked above the deep press intensity threshold (e.g., “IT D ”). Contact  562  is maintained on touch-sensitive surface  560 . In response to the detection of the gesture, and in accordance with contact  562  having an intensity that goes above the deep press intensity threshold (e.g., “IT D ”) during the gesture, reduced-scale representations  578 A- 578 C (e.g., thumbnails) of recently opened documents for App  2  are displayed, as shown in  FIGS. 5F-5H . In some embodiments, the intensity, which is compared to the one or more intensity thresholds, is the characteristic intensity of a contact. It should be noted that the intensity diagram for contact  562  is not part of a displayed user interface, but is included in  FIGS. 5E-5H  to aid the reader. 
     In some embodiments, the display of representations  578 A- 578 C includes an animation. For example, representation  578 A is initially displayed in proximity of application icon  572 B, as shown in  FIG. 5F . As the animation proceeds, representation  578 A moves upward and representation  578 B is displayed in proximity of application icon  572 B, as shown in  FIG. 5G . Then representations  578 A moves upward,  578 B moves upward toward representation  578 A, and representation  578 C is displayed in proximity of application icon  572 B, as shown in  FIG. 5H . Representations  578 A- 578 C form an array above icon  572 B. In some embodiments, the animation progresses in accordance with an intensity of contact  562 , as shown in  FIGS. 5F-5G , where the representations  578 A- 578 C appear and move upwards as the intensity of contact  562  increases toward the deep press intensity threshold (e.g., “IT D ”). In some embodiments the intensity, on which the progress of the animation is based, is the characteristic intensity of the contact. The operations described with reference to  FIGS. 5E-5H  can be performed using an electronic device similar or identical to device  100 ,  300 , or  500 . 
     In some embodiments, the device employs intensity hysteresis to avoid accidental inputs sometimes termed “jitter,” where the device defines or selects a hysteresis intensity threshold with a predefined relationship to the press-input intensity threshold (e.g., the hysteresis intensity threshold is X intensity units lower than the press-input intensity threshold or the hysteresis intensity threshold is 75%, 90%, or some reasonable proportion of the press-input intensity threshold). Thus, in some embodiments, the press input includes an increase in intensity of the respective contact above the press-input intensity threshold and a subsequent decrease in intensity of the contact below the hysteresis intensity threshold that corresponds to the press-input intensity threshold, and the respective operation is performed in response to detecting the subsequent decrease in intensity of the respective contact below the hysteresis intensity threshold (e.g., an “up stroke” of the respective press input). Similarly, in some embodiments, the press input is detected only when the device detects an increase in intensity of the contact from an intensity at or below the hysteresis intensity threshold to an intensity at or above the press-input intensity threshold and, optionally, a subsequent decrease in intensity of the contact to an intensity at or below the hysteresis intensity, and the respective operation is performed in response to detecting the press input (e.g., the increase in intensity of the contact or the decrease in intensity of the contact, depending on the circumstances). 
     For ease of explanation, the descriptions of operations performed in response to a press input associated with a press-input intensity threshold or in response to a gesture including the press input are, optionally, triggered in response to detecting either: an increase in intensity of a contact above the press-input intensity threshold, an increase in intensity of a contact from an intensity below the hysteresis intensity threshold to an intensity above the press-input intensity threshold, a decrease in intensity of the contact below the press-input intensity threshold, and/or a decrease in intensity of the contact below the hysteresis intensity threshold corresponding to the press-input intensity threshold. Additionally, in examples where an operation is described as being performed in response to detecting a decrease in intensity of a contact below the press-input intensity threshold, the operation is, optionally, performed in response to detecting a decrease in intensity of the contact below a hysteresis intensity threshold corresponding to, and lower than, the press-input intensity threshold. 
     Attention is now directed towards embodiments of user interfaces (“UI”) and associated processes that may be implemented on a multifunction device with a display and a touch-sensitive surface, such as devices  100 ,  300 , and/or  500 , to improve a user&#39;s experience in accessing and playing music. 
       FIGS. 6A-6D  illustrate exemplary user interfaces for accessing music using an electronic device, in accordance with some embodiments. In some embodiments, the electronic device is device  500 . The electronic device has a display (e.g.,  112 ,  340 ,  504 ), a touch-sensitive surface (e.g.,  112 ,  355 ,  504 ), and a rotatable input mechanism (e.g.,  506 ). 
       FIG. 6A  illustrates a high-level view of the organization of various user interface screens. These and additional user interface screens will be described in further detail with respect to  FIGS. 6B-6D . User interface screen  602  illustrates a landing screen (e.g., the screen displayed when the application starts or the screen displayed after the application initializes) of a music application (e.g., a digital music player application). From user interface screen  602 , a user can access user interface screen  604 , user interface screen  608 , and user interface screen  614 . 
     User interface screen  604  illustrates playlist selection affordances for accessing various music playlists. Activating a playlist selection affordance causes the device to display user interface screen  606 . User interface screen  606  illustrates song selection affordances of the activated playlist. Activating a song selection affordance causes the device to display user interface screen  616 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. 
     User interface screen  608  illustrates artist selection affordances for accessing music of various artists. Activating an artist selection affordance causes the device to display user interface screen  610 . User interface screen  610  illustrates album selection affordances of the activated artist. Activating an album selection affordance causes the device to display user interface screen  612 , which includes song selection affordances of the selected album of the selected artist. Activating a song selection affordance causes the device to display user interface screen  616 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. 
     User interface screen  606  illustrates song selection affordances. Activating a song selection affordance causes the device to display user interface screen  616 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. 
     The audio playback user interface of user interface screen  616  displays song information (e.g., the title and artist) of an activated (e.g., playing, paused) song. The audio playback user interface also provides enables a user to play/pause, skip forward/backward, scrub to within a time in the song, and adjust the volume, among others. 
     In one embodiment shown in  FIG. 6B , the device displays an affordance  600 A representing a music application (e.g., an icon among a plurality of icons), as illustrated in user interface screen  600 . User interface screen  600  may also include one or more affordances  600 B and  600 C corresponding to other applications, such as a photos application, a phone application, or an electronic mail application. The affordance  600 A, when activated, causes the music application to be displayed. Affordances  600 B and  600 C, when activated, cause the device to start and/or display a corresponding application. 
     The device receives user input representing movement of the rotatable input mechanism (e.g., the user rotates the rotatable input mechanism to activate affordance  600 A, which is substantially in the center of the display). In response to receiving the user input representing the movement of the rotatable input mechanism, the device displays a landing screen (e.g., the screen displayed when the application starts or the screen the application reaches after initialization) of the music application, as illustrated in user interface screen  602 . 
     In another example, rather than received user input representing movement of the rotatable input mechanism, the device detects a touch on the touch-sensitive surface corresponding to affordance  600 A representing the music application. In response to detecting the touch corresponding to the affordance representing the music application, the device displays a landing screen (e.g., the screen displayed when the application starts or the screen the application reaches after initialization) of the music application, as illustrated in user interface screen  602 . 
     User interface screen  602  illustrates a landing screen. The landing screen includes display of a playlist affordance  602 A, an artist list affordance  602 B, and a song list affordance  602 C. In this example, the playlist affordance  602 A, the artist affordance  602 B, and the song affordance  602 C are displayed concurrently. 
     While displaying user interface screen  602 , the device receives user input associated with the landing screen. For example, the user may activate the playlist affordance  602 A, the artist affordance  602 B, or the song affordance  602 C. Generally, displayed items are associated with user inputs in a contextual manner, such as the user input being received at a location on the touch-sensitive surface that corresponds to the location of the displayed item on the display to activate the displayed item. 
     The device determines whether the user input associated with the landing screen represents a touch associated with the playlist affordance  602 A, the artist affordance  602 B, or the song affordance  602 C. 
     In response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the playlist affordance  602 A, the device displays one or more playlist selection affordances  604 A- 604 C, as illustrated in user interface screen  604 . Thus, the playlist affordance  602 A, when activated, causes display of one or more playlist selection affordances, such as a list of the names of playlists are accessible by the device, for selecting a playlist. 
     In response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the artist list affordance, the device displays one or more artist selection affordances  608 A- 608 C, such as illustrated in user interface screen  608 . Thus, the artist list affordance  602 B, when activated, causes display of one or more artist selection affordances, such as a list of the names of the artists for which songs are accessible by the device, for selecting an artist. 
     In response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the song list affordance, the device displays one or more song selection affordances  614 A- 614 B, such as illustrated in user interface screen  614 . Thus, the song list affordance, when activated, causes display of one or more song affordances, such as a list of the names of the artists for which songs are accessible by the device, for selecting an artist. 
     In accordance with some embodiments, the electronic device includes a touch-sensitive surface configured to detect intensity of touches. While displaying the one or more playlist selection affordances  604 A- 604 C, as illustrated in user interface screen  604 , the device receives user input representing a touch on a playlist selection affordance  604 B (e.g., titled “Relax”) of the one or more playlist selection affordances  604 A- 604 C. The device determines whether a characteristic intensity of the touch on the playlist selection affordance exceeds an intensity threshold For example, the intensity may be measured based on pressure or determined based on the size of a touch. In accordance with a determination that the characteristic intensity of the touch on the playlist selection affordance exceeds the intensity threshold (e.g., a deep press), the device displays a first set of affordances, as illustrated in user interface screen  620  of  FIG. 6D . 
     In accordance with some embodiments, the first set of affordances includes a source affordance  620 A, as illustrated in user interface screen  620 . The source affordance  620 A, when activated, causes display of affordances for selecting a source for music, such as music stored locally on the device, music stored remotely on an external electronic device, or the combination. The device may be linked to the external electronic device using short-range wireless communications, such as WiFi or Bluetooth technology. 
     In accordance with some embodiments, in response to receiving the user input representing the touch on the playlist selection affordance and in accordance with a determination that the characteristic intensity of the touch on the playlist selection affordance does not exceed the intensity threshold (e.g., a light press; intensity may be measured based on pressure or determined based on the size of a touch), displaying, on the display, one or more song selection affordances of a playlist associated with the playlist selection affordance. That is, the playlist selection affordance, when activated with a light touch, causes display of a list of songs of a playlist. The list of songs may be a subset of the songs accessible by the device. 
     In accordance with some embodiments, while displaying the one or more song selection affordances  606 A- 606 B of the playlist, as illustrated in user interface screen  606  of  FIG. 6C , the device receives user input representing a touch on a song selection affordance  606 A of the one or more song selection affordances  606 A- 606 B of the playlist. The device determines whether a characteristic intensity of the touch on the song selection affordance  606 A exceeds an intensity threshold. In accordance with a determination that the characteristic intensity of the touch on the song selection affordance  606 A exceeds the intensity threshold (e.g., a deep press), the device displays a second set of affordances  624 A- 624 B, as illustrated in user interface screen  624  of  FIG. 6D . 
     In accordance with some embodiments, the second set of affordances  624 A- 624 B includes one or more of a shuffle affordance  624 A and a source affordance  624 B, as illustrated in user interface screen  624 . The shuffle affordance  624 A, when activated, causes the device to play back the songs in the playlist in a shuffled order (e.g., a random or pseudo-random order). The source affordance  624 B, when activated, causes display of affordances for selecting a source for music, such as music stored locally on the device, music stored remotely on an external electronic device, or the combination. The device may be linked to the external electronic device using short-range wireless communications, such as WiFi or Bluetooth technology. 
     In accordance with some embodiments, in response to receiving the user input representing the touch on the song selection affordance  606 A and in accordance with a determination that the characteristic intensity of the touch on the song selection affordance  606 A does not exceed the intensity threshold (e.g., a light press), the device displays an audio playback user interface (e.g., a “now playing” screen), such as illustrated in user interface screen  616 , and the device starts audio playback of an audio file associated with the song selection affordance  606 A (e.g., start audio playback of music). 
     In accordance with some embodiments, the electronic device includes a touch-sensitive surface configured to detect intensity of touches. While displaying the one or more artist selection affordances  608 A- 608 B, the device receives user input representing a touch on an artist selection affordance  608 A of the one or more artist selection affordances  608 A- 608 B. The device determines whether a characteristic intensity of the touch on the artist selection affordance  608 A exceeds an intensity threshold. In accordance with a determination that the characteristic intensity of the touch on the artist selection affordance  608 A exceeds the intensity threshold (e.g., a deep press; intensity may be measured based on pressure or determined based on the size of a touch), the device displays a third set of affordances, as illustrated in user interface screen  620  of  FIG. 6D . 
     In accordance with some embodiments, the third set of affordances includes a source affordance. The source affordance, when activated, causes display of affordances for selecting a source for music, such as music stored locally on the device, music stored remotely on an external electronic device, or the combination. The device may be linked to the external electronic device using short-range wireless communications, such as WiFi or Bluetooth technology. 
     In accordance with some embodiments, in response to receiving the user input representing the touch on the artist selection affordance  608 A and in accordance with a determination that the characteristic intensity of the touch on the artist selection affordance  608 A does not exceed the intensity threshold (e.g., a light press), the device displays one or more album selection affordances  610 A- 610 B of an artist associated with the artist selection affordance  608 A, as illustrated in user interface screen  610  of  FIG. 6C . Thus, the artist selection affordance  608 A, when activated with a light press, causes display of a list of albums of the artist. The list of albums may be a subset of the albums accessible by the device, and may be limited to albums that include the selected artist. 
     In accordance with some embodiments, while displaying the one or more album selection affordances  610 A- 610 B of the artist, the device receives user input representing a touch on an album selection affordance  610 A of the one or more album selection affordances  610 A- 610 B of the artist. The device determines whether a characteristic intensity of the touch on the album selection affordance  610 A exceeds an intensity threshold. In accordance with a determination that the characteristic intensity of the touch on the album selection affordance  610 A exceeds the intensity threshold (e.g., a deep press), the device displays a fourth set of affordances, as illustrated in user interface screen  620  of  FIG. 6D . 
     In accordance with some embodiments, the fourth set of affordances includes a source affordance  620 A, as illustrated in user interface screen  620 . The source affordance  620 A, when activated, causes display of affordances for selecting a source for music, such as music stored locally on the device, music stored remotely on an external electronic device, or the combination. The device may be linked to the external electronic device using short-range wireless communications, such as WiFi or Bluetooth technology. 
     In accordance with some embodiments, in response to receiving the user input representing the touch on the album selection affordance  610 A and in accordance with a determination that the characteristic intensity of the touch on the album selection affordance  610 A does not exceed the intensity threshold (e.g., a light press), the device displays one or more song selection affordances  612 A- 612 B of an album associated with the album selection affordance  610 A, as illustrated in user interface screen  612 . Thus, the album selection affordance  610 A, when activated with a light press, causes display of a list of songs of the album  612 A- 612 B, where the songs are also limited to the selected artist. 
     In accordance with some embodiments, while displaying the one or more song selection affordances  612 A- 612 B of the album associated with the album selection affordance  610 A, as illustrated in user interface screen  612 , the device receives user input representing a touch on a song selection affordance  612 A of the one or more song selection affordances  612 A- 612 B of the album associated with the album selection affordance  610 A. The device determines whether a characteristic intensity of the touch on the song selection affordance  612 A exceeds an intensity threshold. In accordance with a determination that the characteristic intensity of the touch on the song selection affordance  612 A exceeds the intensity threshold (e.g., a deep press), the device displays a fifth set of affordances, as illustrated in user interface screen  624 . 
     In accordance with some embodiments, the fifth set of affordances includes one or more of a shuffle affordance  624 A and a source affordance  624 B, as illustrated in user interface screen  624 . The shuffle affordance  624 A, when activated, causes the device to play back the songs of the album of the arts in a shuffled order (e.g., a random or pseudo-random order). The source affordance  624 B, when activated, causes display of affordances for selecting a source for music, such as music stored locally on the device, music stored remotely on an external electronic device, or the combination. The device may be linked to the external electronic device using short-range wireless communications, such as WiFi or Bluetooth technology. 
     In accordance with some embodiments, in response to receiving the user input representing the touch on the song selection affordance  612 A and in accordance with a determination that the characteristic intensity of the touch does not exceed the intensity threshold (e.g., a light press), the device displays an audio playback user interface (e.g., display a “now playing” screen), such as illustrated in user interface screen  616 , and the device starts audio playback of an audio file associated with the song selection affordance  612 A. 
     In accordance with some embodiments, the electronic device includes a touch-sensitive surface configured to detect intensity of touches. While displaying the one or more song selection affordances of user interface screen  614 , the device receives user input representing a touch on a song selection affordance  614 A of the one or more song selection affordances  614 A- 614 B. The device determines whether a characteristic intensity of the touch on the song selection affordance  614 A exceeds an intensity threshold. In accordance with a determination that the characteristic intensity of the touch on the song selection affordance  614 A exceeds the intensity threshold (e.g., a deep press), the device displays a sixth set of affordances, as illustrated in user interface screen  624  of  FIG. 6D . 
     In accordance with some embodiments, the sixth set of affordances includes one or more of a shuffle affordance  624 A and a source affordance  624 B. The shuffle affordance  624 A, when activated, causes the device to play back the songs of the current source in a shuffled order (e.g., a random or pseudo-random order). The source affordance  624 B, when activated, causes display of affordances for selecting a source for music, such as music stored locally on the device, music stored remotely on an external electronic device, or the combination. The device may be linked to the external electronic device using short-range wireless communications, such as WiFi or Bluetooth technology. 
     In accordance with some embodiments, in response to receiving the user input representing the touch on the song selection affordance  614 A and in accordance with a determination that the characteristic intensity of the touch on the song selection affordance  614 A does not exceed the intensity threshold (e.g., a light press), the device displays an audio playback user interface (e.g., a “now playing” screen), as illustrated in user interface screen  616 , and the device starts audio playback of an audio file associated with the song selection affordance  614 A. 
     In accordance with some embodiments, while displaying the audio playback user interface of user interface screen  616 , the device receives user input representing a touch on the audio playback user interface. The device determines whether a characteristic intensity of the touch on the audio playback user interface exceeds an intensity threshold. In accordance with a determination that the characteristic intensity of the touch on the audio playback user interface exceeds the intensity threshold (e.g., a deep press), the device displays a seventh set of affordances, as illustrated in user interface screen  622  of  FIG. 6D . In accordance with a determination that the characteristic intensity of the touch on the audio playback user interface does not exceed the intensity threshold (e.g., a light press), the device foregoes displaying the seventh set of affordances. 
     In accordance with some embodiments, the seventh set of affordances includes one or more of a shuffle affordance  622 A, a repeat affordance  622 B, and a source affordance  622 C, as illustrated in user interface screen  622 . The shuffle affordance  622 A, when activated, causes the device to play back an identified list of songs in a shuffled order (e.g., a random or pseudo-random order). The repeat affordance  622 B, when activated, causes the device to repeatedly play the currently playing (or selected) song, rather than playing a different song after the currently playing (or selected) song ends. The source affordance  622 C, when activated, causes display of affordances for selecting a source for music, such as music stored locally on the device, music stored remotely on an external electronic device, or the combination. The device may be linked to the external electronic device using short-range wireless communications, such as WiFi or Bluetooth technology. 
     In accordance with some embodiments, the device receives user input. For example, the user presses a home button to return to user interface screen  600  that includes the affordance representing the music application  600 A. In response to receiving the user input, the device displays the affordance representing the music application  600 A. In some examples, the device also concurrently displays affordances representing other applications, such as photos affordance  626 B and phone affordance  626 C (e.g., an icon among a plurality of icons). The device determines whether the music application is currently playing an audio file. In accordance with a determination that the music application is currently playing an audio file, the device displays an affordance  626 A representing the audio playback user interface (e.g., the device displays a persistent bar at the top of the display). In some examples, the affordance representing the music application  600 A and the affordance representing the audio playback user interface  626 A are displayed concurrently, as illustrated in user interface screen  626 . 
     The device receives user input representing a touch on the affordance  626 A representing the audio playback user interface (e.g., the user taps on the persistent bar that the top of the display). In response to receiving the user input representing the touch on the affordance  626 A representing the audio playback user interface, the device displays the audio playback user interface, such as illustrated in user interface screen  616 . Thus, the affordance  626 A representing the audio playback user interface, when activated, causes display of the “now playing” screen. The “now playing” screen provides an indication of the currently playing audio file and provides affordances for pausing the audio file  616 A, scrubbing forward/backward within the audio file  616 B, skipping to the next audio file  616 C, skipping back to the previous audio file  616 D, adjusting volume  616 E, and the like. In some embodiments, while displaying the “now playing list, as illustrated in user interface screen  616 , the rotatable input mechanism is used for adjusting the volume of audio playing. In accordance with detecting rotation of the rotatable input mechanism in a first direction, the volume of audio is increased, as illustrated by image  616 F. In accordance with detecting rotation of the rotatable input mechanism in a second direction, the volume of audio is decreased, as illustrated by image  616 F. The first direction and the second direction are different. 
     In accordance with some embodiments, the device receives user input. In response to receiving the user input, the device displays a user interface for an application, wherein the application and the music application are different applications (e.g., a mail application). For example, the user presses a button or performs another action to activate another application, which is not the music application. The device determines whether the music application is currently playing an audio file. In accordance with a determination that the music application is currently playing an audio file, the device displays an affordance representing the audio playback user interface (e.g., a persistent bar at the top of the display of the user interface for the application). The affordance representing the audio playback user interface and the user interface for the application are displayed concurrently. 
     In accordance with some embodiments, the device receives user input representing a touch on the affordance representing the audio playback user interface (e.g., user taps on the persistent bar that the top of the display). In response to receiving the user input representing the touch on the affordance representing the audio playback user interface, the device replaces display of the user interface for the application with display of a user interface for the music application. Thus, when an audio file is playing, the user can switch to (e.g., start) a different application (e.g., a non-music application). An affordance will appear on the display which, when activated, causes the “now playing” screen to be displayed. This allows the user efficient access to the “now playing” screen for pausing, forwarding, etc., even when the user is using an application other than the music application. In accordance with some embodiments, the user interface for the music application comprises the audio playback user interface. 
     In accordance with some embodiments, the device determines whether the music application is currently playing an audio file. In accordance with a determination that the music application is currently playing an audio file, the device displays an affordance representing the audio playback user interface (e.g., a persistent bar at the top of the display). The device receives user input representing a touch on the affordance representing the audio playback user interface (e.g., user taps on the persistent bar that the top of the display). In response to receiving the user input representing the touch on the affordance representing the audio playback user interface, the device displays the audio playback user interface. Thus, the affordance representing the audio playback user interface, when activated, causes display of the “now playing” screen. 
     In accordance with some embodiments, the device determines whether a phone call is currently active, the currently active phone call associated with a phone application. In accordance with a determination that a phone call is currently active, the device displays an affordance representing the phone application, wherein the affordance representing the phone application and the affordance representing the audio playback user interface are displayed concurrently (e.g., they persistent at the top of the display). The device receives user input representing a touch on the affordance representing the phone application. In response to receiving the user input representing the touch on the affordance representing the phone application, the device displays a user interface of the phone application. 
     In accordance with some embodiments, the song selection affordance of the one or more song selection affordances (e.g.,  606 A of  606 A- 606 B,  612 A of  612 A- 612 B,  614 B of  614 A- 614 B) includes an indication (e.g.,  606 C,  612 C,  614 C) of being stored locally on the electronic device (e.g., the song is available for playback from local memory). In this example, the selected song ( 606 A,  612 A,  614 B) is stored locally. 
     In accordance with some embodiments, the song selection affordance of the one or more song selection affordances (e.g.,  606 A of  606 A- 606 B,  612 A of  612 A- 612 B,  614 B of  614 A- 614 B) includes an indication (e.g.,  606 C,  612 C,  614 C) of not being stored locally on the electronic device (e.g., the song is not stored locally, but is available for playback through download or stream from an external electronic device, such as a phone or server). In this example, the selected song ( 606 A,  612 A,  614 B) is not stored locally. 
     In accordance with some embodiments, the song selection affordance of the one or more song selection affordances (e.g.,  606 A of  606 A- 606 B,  612 A of  612 A- 612 B,  614 B of  614 A- 614 B) includes an indication (e.g.,  606 C,  612 C,  614 C) of being stored on an external electronic device (e.g., the song is available for playback through download or stream from an external electronic device, such as a phone or server). In this example, the selected song ( 606 A,  612 A,  614 B) is available stored on an external electronic device. 
       FIG. 7  is a flow diagram illustrating an exemplary process for accessing and playing music in accordance with some embodiments. In some embodiments, method  700  may be performed at an electronic device with a display (e.g.,  112 ,  340 ,  504 ) and a rotatable input mechanism (e.g.,  506 ). In some embodiments, the electronic device also includes a touch-sensitive surface (e.g.,  112 ,  355 ,  504 ). Some operations in method  700  may be combined, the order of some operations in method  700  may be changed, and some operations in method  700  may be omitted. 
     In some embodiments, the touch-sensitive surface (e.g.,  112 ,  355 ,  504 ) is capable of detecting intensity of touch contacts. Exemplary devices that may perform method  700  include devices  100 ,  300 , and  500  ( FIGS. 1A, 3, and 5A ). 
     Method  700  provides an intuitive way to access and play music. The method reduces the cognitive burden on a user when using a device to access and play music, thereby creating a more efficient human-machine interface. For battery-operated computing devices, enabling a user to access and play music more quickly and more efficiently conserves power and increases the time between battery charges. 
     At block  702 , an affordance (e.g.,  600 A) representing a music application is displayed. 
     At block  704 , user input representing movement of the rotatable input mechanism is received. In some embodiments, a touch on the touch-sensitive surface corresponding to the affordance (e.g.,  600 A) representing the music application is received, instead. 
     At block  706 , in response to receiving the user input representing the movement of the rotatable input mechanism, a landing screen of the music application is displayed. In some embodiments, in response to detecting the touch corresponding to the affordance (e.g.,  600 A), a landing screen of the music application is displayed. The landing screen includes display of a playlist affordance (e.g.,  602 A), an artist list affordance (e.g.,  602 B), and a song list affordance (e.g.,  602 C). 
     At block  708 , user input associated with the landing screen is received. 
     At block  710 , it is determined whether the user input associated with the landing screen represents a touch associated with the playlist affordance (e.g.,  602 A), the artist affordance (e.g.,  602 B), or the song affordance (e.g.,  602 C). 
     At block  712 , in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the playlist affordance (e.g.,  602 A), one or more playlist selection affordances (e.g.,  604 A- 604 C) are displayed. 
     At block  714 , in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the artist list affordance (e.g.,  602 B), one or more artist selection affordances (e.g.,  608 A- 608 C) are displayed. 
     At block  716 , in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the song list affordance (e.g.,  602 C), one or more song selection affordances (e.g.,  614 A- 614 B) are displayed. 
     In accordance with some embodiments, the electronic device includes a touch-sensitive surface configured to detect intensity of touches. While displaying the one or more playlist selection affordances (e.g.,  604 A- 604 C), user input representing a touch on a playlist selection affordance (e.g.,  604 B) of the one or more playlist selection affordances (e.g.,  604 A- 604 C) is received. It is determined whether a characteristic intensity of the touch on the playlist selection affordance (e.g.,  604 B) exceeds an intensity threshold. In accordance with a determination that the characteristic intensity of the touch on the playlist selection affordance (e.g.,  604 B) exceeds the intensity threshold (e.g., a deep press), a first set of affordances are displayed. In accordance with some embodiments, the first set of affordances includes a source affordance (e.g.,  620 A). 
     In accordance with some embodiments, in response to receiving the user input representing the touch on the playlist selection affordance (e.g.,  604 B) and in accordance with a determination that the characteristic intensity of the touch on the playlist selection affordance (e.g.,  604 B) does not exceed the intensity threshold (e.g., a light press), one or more song selection affordances (e.g.,  606 A- 606 B) of a playlist associated with the playlist selection affordance (e.g.,  604 B) are displayed. 
     In accordance with some embodiments, while displaying the one or more song selection affordances (e.g.,  606 A- 606 B) of the playlist, user input representing a touch on a song selection affordance (e.g.,  606 A) of the one or more song selection affordances (e.g.,  606 A- 606 B) of the playlist is received. It is determined whether a characteristic intensity of the touch on the song selection affordance (e.g.,  606 A) exceeds an intensity threshold. In accordance with a determination that the characteristic intensity of the touch on the song selection affordance (e.g.,  606 A) exceeds the intensity threshold (e.g., a deep press), a second set of affordances are displayed. In accordance with some embodiments, the second set of affordances includes one or more of a shuffle affordance (e.g.,  624 A) and a source affordance (e.g.,  624 B). 
     In accordance with some embodiments, in response to receiving the user input representing the touch on the song selection affordance (e.g.,  606 A) and in accordance with a determination that the characteristic intensity of the touch on the song selection affordance (e.g.,  606 A) does not exceed the intensity threshold (e.g., a light press), an audio playback user interface is displayed and audio playback of an audio file associated with the song selection affordance (e.g.,  606 A) is started. 
     In accordance with some embodiments, the electronic device includes a touch-sensitive surface configured to detect intensity of touches. While displaying the one or more artist selection affordances (e.g.,  608 A- 608 C), user input representing a touch on an artist selection affordance (e.g.,  608 A) of the one or more artist selection affordances (e.g.,  608 A- 608 C) is received. It is determined whether a characteristic intensity of the touch on the artist selection affordance (e.g.,  608 A) exceeds an intensity threshold. In accordance with a determination that the characteristic intensity of the touch on the artist selection affordance (e.g.,  608 A) exceeds the intensity threshold (e.g., a deep press), a third set of affordances is displayed. In accordance with some embodiments, the third set of affordances includes a source affordance (e.g.,  620 A). 
     In accordance with some embodiments, in response to receiving the user input representing the touch on the artist selection affordance (e.g.,  608 A) and in accordance with a determination that the characteristic intensity of the touch on the artist selection affordance (e.g.,  608 A) does not exceed the intensity threshold (e.g., a light press), one or more album selection affordances (e.g.,  610 A- 610 B) of an artist associated with the artist selection affordance (e.g.,  608 A) are displayed. 
     In accordance with some embodiments, while displaying the one or more album selection affordances (e.g.,  610 A- 610 B) of the artist, receiving user input representing a touch on an album selection affordance (e.g.,  610 A) of the one or more album selection affordances (e.g.,  610 A- 610 B) of the artist. It is determined whether a characteristic intensity of the touch on the album selection affordance (e.g.,  610 A) exceeds an intensity threshold. In accordance with a determination that the characteristic intensity of the touch on the album selection affordance (e.g.,  610 A) exceeds the intensity threshold (e.g., a deep press), a fourth set of affordances is displayed. In accordance with some embodiments, the fourth set of affordances includes a source affordance (e.g.,  620 A). 
     In accordance with some embodiments, in response to receiving the user input representing the touch on the album selection affordance (e.g.,  610 A) and in accordance with a determination that the characteristic intensity of the touch on the album selection affordance (e.g.,  610 A) does not exceed the intensity threshold (e.g., a light press), one or more song selection affordances (e.g.,  612 A- 612 B) of an album associated with the album selection affordance (e.g.,  610 A) are displayed. 
     In accordance with some embodiments, while displaying the one or more song selection affordances (e.g.,  612 A- 612 B) of the album associated with the album selection affordance (e.g.,  610 A), user input representing a touch on a song selection affordance (e.g.,  612 A) of the one or more song selection affordances (e.g.,  612 A- 612 B) of the album associated with the album selection affordance (e.g.,  610 A) is received. It is determined whether a characteristic intensity of the touch on the song selection affordance (e.g.,  612 A) exceeds an intensity threshold. In accordance with a determination that the characteristic intensity of the touch on the song selection affordance (e.g.,  612 A) exceeds the intensity threshold (e.g., a deep press), a fifth set of affordances are displayed. In accordance with some embodiments, the fifth set of affordances includes one or more of a shuffle affordance (e.g.,  624 A) and a source affordance ( 624 B). 
     In accordance with some embodiments, in response to receiving the user input representing the touch on the song selection affordance (e.g.,  612 A) and in accordance with a determination that the characteristic intensity of the touch on the song selection affordance (e.g.,  612 A) does not exceed the intensity threshold (e.g., a light press), an audio playback user interface is displayed (e.g.,  616 ) and audio playback of an audio file associated with the song selection affordance (e.g.,  612 A) is started. 
     In accordance with some embodiments, the electronic device includes a touch-sensitive surface configured to detect intensity of touches. While displaying the one or more song selection affordances (e.g.,  614 A- 614 B), user input representing a touch on a song selection affordance (e.g.,  614 B) of the one or more song selection affordances (e.g.,  614 A- 614 B) is received. It is determined whether a characteristic intensity of the touch on the song selection affordance (e.g.,  614 B) exceeds an intensity threshold. In accordance with a determination that the characteristic intensity of the touch on the song selection affordance (e.g.,  614 B) exceeds the intensity threshold (e.g., a deep press), a sixth set of affordances is displayed. In accordance with some embodiments, the sixth set of affordances includes one or more of a shuffle affordance (e.g.,  624 A) and a source affordance (e.g.,  624 B). 
     In accordance with some embodiments, in response to receiving the user input representing the touch on the song selection affordance (e.g.,  614 B) and in accordance with a determination that the characteristic intensity of the touch on the song selection affordance (e.g.,  614 B) does not exceed the intensity threshold (e.g., a light press), an audio playback user interface (e.g.,  616 ) is displayed and audio playback of an audio file associated with the song selection affordance (e.g.,  614 B) is started. 
     In accordance with some embodiments, while displaying the audio playback user interface (e.g.,  616 ), user input representing a touch on the audio playback user interface is received. It is determined whether a characteristic intensity of the touch on the audio playback user interface (e.g.,  616 ) exceeds an intensity threshold. In accordance with a determination that the characteristic intensity of the touch on the audio playback user interface (e.g.,  616 ) exceeds the intensity threshold (e.g., a deep press), a seventh set of affordances is displayed. In accordance with some embodiments, the seventh set of affordances includes one or more of a shuffle affordance (e.g.,  622 A), a repeat affordance (e.g.,  622 B), and a source affordance (e.g.,  622 C). 
     In accordance with some embodiments, user input is received. In response to receiving the user input, the affordance representing the music application (e.g.,  600 A) is displayed. It is determined whether the music application is currently playing an audio file. In accordance with a determination that the music application is currently playing an audio file, an affordance representing the audio playback user interface (e.g.,  626 A) is displayed. User input representing a touch on the affordance representing the audio playback user interface (e.g.,  626 A) is received. In response to receiving the user input representing the touch on the affordance representing the audio playback user interface (e.g.,  626 A), the audio playback user interface (e.g.,  616 ) is displayed. 
     In accordance with some embodiments, user input is received. In response to receiving the user input, a user interface for an application is displayed, wherein the application and the music application are different applications. It is determined whether the music application is currently playing an audio file. In accordance with a determination that the music application is currently playing an audio file, an affordance representing the audio playback user interface is displayed, wherein the affordance representing the audio playback user interface and the user interface for the application are displayed concurrently. 
     In accordance with some embodiments, user input representing a touch on the affordance representing the audio playback user interface is received. In response to receiving the user input representing the touch on the affordance representing the audio playback user interface, display of the user interface for the application is replaced with display of a user interface for the music application. In accordance with some embodiments, the user interface for the music application comprises the audio playback user interface (e.g.,  616 ). 
     In accordance with some embodiments, it is determined whether the music application is currently playing an audio file. In accordance with a determination that the music application is currently playing an audio file, an affordance representing the audio playback user interface is displayed. User input representing a touch on the affordance representing the audio playback user interface is received. In response to receiving the user input representing the touch on the affordance representing the audio playback user interface, the audio playback user interface (e.g.,  616 ) is displayed 
     In accordance with some embodiments, it is determined whether a phone call is currently active, the currently active phone call associated with a phone application. In accordance with a determination that a phone call is currently active, an affordance representing the phone application is displayed, wherein the affordance representing the phone application and the affordance representing the audio playback user interface are displayed concurrently. User input representing a touch on the affordance representing the phone application is received. In response to receiving the user input representing the touch on the affordance representing the phone application, a user interface of the phone application is displayed. 
     In accordance with some embodiments, the song selection affordance of the one or more song selection affordances (e.g.,  606 A of  606 A- 606 B,  612 A of  612 A- 612 B,  614 B of  614 A- 614 B) includes an indication (e.g.,  606 C,  612 C,  614 C) of being stored locally on the electronic device. 
     In accordance with some embodiments, the song selection affordance of the one or more song selection affordances (e.g.,  606 A of  606 A- 606 B,  612 A of  612 A- 612 B,  614 B of  614 A- 614 B) includes an indication (e.g.,  606 C,  612 C,  614 C) of not being stored locally on the electronic device. 
     In accordance with some embodiments, the song selection affordance of the one or more song selection affordances (e.g.,  606 A of  606 A- 606 B,  612 A of  612 A- 612 B,  614 B of  614 A- 614 B) includes an indication (e.g.,  606 C,  612 C,  614 C) of being stored on an external electronic device. 
     It should be understood that the particular order in which the operations in  FIG. 7  have been described is exemplary and not intended to indicate that the described order is the only order in which the operations could be performed. One of ordinary skill in the art would recognize various ways to reorder the operations described herein, as well as excluding certain operations. For brevity, these details are not repeated here. 
     In accordance with some embodiments,  FIG. 8  shows an exemplary functional block diagram of an electronic device  800  configured in accordance with the principles of the various described embodiments. In accordance with some embodiments, the functional blocks of electronic device  800  are configured to perform the techniques described above. The functional blocks of the device  800  are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described examples. It is understood by persons of skill in the art that the functional blocks described in  FIG. 8  are, optionally, combined or separated into sub-blocks to implement the principles of the various described examples. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     As shown in  FIG. 8 , an electronic device  800  includes a display unit  802  configured to display graphical objects; a touch-sensitive surface unit  804  configured to receive user gestures (e.g., touches); one or more RF units  806  configured to detect and communicate with external electronic devices; and a processing unit  808  coupled to display unit  802 , touch-sensitive surface unit  804 , and RF units  806 . In some embodiments, the processing unit  808  includes a display enabling unit  810 , a receiving unit  812 , and a determining unit  814 . The units of  FIG. 8  may be used to implement the various techniques and methods described above with respect to  FIGS. 6-7 . 
     For example, the display enabling unit  810  can be used for: displaying, on the display, an affordance representing a music application; displaying a landing screen of the music application; displaying, on the display, one or more playlist selection affordances; displaying, on the display, one or more artist selection affordances; and displaying, on the display, one or more song selection affordances. 
     For example, the receiving unit  812  can be used for: receiving user input representing movement of the rotatable input mechanism; receiving user input associated with the landing screen. 
     For example, the determining unit  814  can be used for: determining whether the user input associated with the landing screen represents a touch associated with the playlist affordance, the artist affordance, or the song affordance. 
     The functional blocks of the device  800  are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described examples. It is understood by persons of skill in the art that the functional blocks described in  FIG. 8  are, optionally, combined or separated into sub-blocks to implement the principles of the various described examples. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     The operations described above with reference to  FIG. 7  are, optionally, implemented by components depicted in  FIGS. 1A-1B, 5A-5B, and 8 . For example, displaying operation  702 ; receiving operation  704 ; and determining operation  710  are, optionally, implemented by event sorter  170 , event recognizer  180 , and event handler  190 . Event monitor  171  in event sorter  170  detects a contact on touch-sensitive display  112 , and event dispatcher module  174  delivers the event information to application  136 - 1 . A respective event recognizer  180  of application  136 - 1  compares the event information to respective event definitions  186 , and determines whether a first contact at a first location on the touch-sensitive surface (or whether rotation of the device) corresponds to a predefined event or sub-event, such as selection of an object on a user interface, or rotation of the device from one orientation to another. When a respective predefined event or sub-event is detected, event recognizer  180  activates an event handler  190  associated with the detection of the event or sub-event. Event handler  190  optionally uses or calls data updater  176  or object updater  177  to update the application internal state  192 . In some embodiments, event handler  190  accesses a respective GUI updater  178  to update what is displayed by the application. Similarly, it would be clear to a person having ordinary skill in the art how other processes can be implemented based on the components depicted in  FIGS. 1A-1B . 
       FIGS. 9A-9C  illustrate exemplary user interfaces for accessing music using an electronic device, in accordance with some embodiments. In some embodiments, the electronic device is device  500 . The electronic device has a display (e.g.,  112 ,  340 ,  504 ), a touch-sensitive surface (e.g.,  112 ,  355 ,  504 ), and a rotatable input mechanism (e.g.,  506 ). 
       FIG. 9A  illustrates a high-level view of the organization of various user interface screens. These and additional user interface screens will be described in further detail with respect to  FIGS. 9B-9C . User interface screen  904  illustrates a navigation screen (e.g., the screen displayed after receiving a movement of the rotatable input mechanism at a now playing screen  902 ) of a music application (e.g., a digital music player application). From user interface screen  904 , a user can access user interface screen  906 , user interface screen  910 , and user interface screen  916 . User interface screen  902  includes an audio playback user interface of a music application (e.g., a digital music player application). In some embodiments, user interface screen  902  functions as described with respect to user interface screen  616 , user interface screen  904  functions as described with respect to user interface screen  602 , user interface screen  906  functions as described with respect to user interface screen  604 , user interface screen  910  functions as described with respect to user interface screen  608 , and user interface screen  916  functions as described with respect to user interface screen  614 . 
     User interface screen  906  illustrates playlist selection affordances  906 A- 906 C for accessing various music playlists. Activating a playlist selection affordance causes the device to display user interface screen  908 . User interface screen  908  illustrates song selection affordances  908 A- 908 B of an activated playlist. Activating a song selection affordance causes the device to display user interface screen  902 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. In some embodiments, a song selection affordance of user interface  908  (or other user interfaces with one or more song selection affordances) includes (or is display adjacent to) an indicator  908 C, which provides an indication of the associated song being stored locally on the electronic device (e.g., the song is available for playback from local memory). In accordance with some embodiments, indicator  908 C provides an indication of the associated song being available but not being stored locally on the electronic device (e.g., the song is not stored locally, but is available for playback through download or stream from an external electronic device, such as a phone or server). In accordance with some embodiments an indicator  908 C may provide an indication of the associated song not being available for playback (e.g., not stored locally on the electronic and not stored on an external electronic and available for playback through download or stream). In some embodiments, user interface screen  908  functions as described with respect to user interface screen  606 . 
     User interface screen  910  illustrates artist selection affordances  910 A- 910 C for accessing music of various artists. Activating an artist selection affordance causes the device to display user interface screen  912 . User interface screen  912  includes album selection affordances  912 A- 912 B of the activated artist. Activating an album selection affordance causes the device to display user interface screen  914 , which includes song selection affordances  914 A- 914 B of the selected album of the selected artist. Activating a song selection affordance causes the device to display user interface screen  902 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. A song selection affordance  914 A of user interface  914  may also contain an indicator  914 C, similar to indicator  908 C. Thus, a user can select an artist to view albums that include songs by that artist, and select an album to view songs in the albums. Activating a song selection affordance plays a song associated with the affordance, and causes display of the audio playback user interface of user interface screen  902 . In some embodiments, user interface screen  912  functions as described with respect to user interface screen  610  and user interface screen  914  functions as described with respect to user interface screen  612 . 
     User interface screen  916  illustrates song selection affordances ( 916 A- 916 C). Activating a song selection affordance causes the device to display user interface screen  902 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. 
     The audio playback user interface of user interface screen  902  displays song information (e.g., the title and artist) of an activated (e.g., playing, paused) song. The audio playback user interface of user interface  902  may contain affordances (e.g.,  902 A- 902 F) that, when activated, cause the device to play/pause, skip forward/backward, scrub to within a time in the song, and adjust the volume, among other functionalities for audio playback control. Similarly, user interface screen  918  illustrates an audio playback user interface with affordances  918 A- 918 F wherein the interface has been updated, for example, to reflect a newly selected or different song. 
     In some embodiments, as illustrated in  FIG. 9B , the device displays an audio playback user interface  902 . The device receives a first user input representing movement (e.g., a rotation) of the rotatable input mechanism in a rotation direction. 
     In response to receiving the first user input representing the movement (e.g., a rotation) of the rotatable input mechanism in the rotation direction, the device ceases display of the audio playback user interface (e.g.,  902 ) and displays a navigation screen (e.g.,  904 ), wherein the navigation screen (e.g.,  904 ) includes a playlist affordance (e.g.,  904 A), an artist list affordance (e.g.,  904 B), and a song list affordance (e.g.,  904 C). For example, upon receiving movement of the rotatable input mechanism at a now playing screen  902 , the device displays a navigation screen, illustrated by user interface  904 , which contains affordances  904 A- 904 C. The navigation screen provides a screen for accepting user input, and allows intuitive browsing of music organized by categories such as by playlist, artist, song, and/or the like. Affordances  904 A,  904 B, and  904 C may represent a playlist affordance, an artist list affordance, and a song list affordance of a music application, respectively. 
     The device receives a second user input (e.g., a touch) associated with the navigation screen (e.g.,  904 ). In response to receiving the second user input, the device determines whether the second user input represents a contact on the touch-sensitive surface (e.g., a touch) and is associated with the playlist affordance (e.g.,  904 A), the artist list affordance (e.g.,  904 B), or the song list affordance (e.g.,  904 C). For example, upon receiving user input representing a touch, the device determines whether the touch is associated with a playlist, artist or song category (e.g., set of user interfaces), represented by affordances  904 A,  904 B, and  904 C, respectively. 
     In response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the playlist affordance (e.g.,  904 A), the device ceases display of the navigation screen (e.g.,  904 ) and displays a first playlist user interface (e.g.,  906 ) of two or more playlist user interfaces (e.g.,  906 ,  908 ). For example, the device receives a touch associated with playlist affordance  904 A, and in response displays a list of playlists, illustrated by user interface  906 . The list of playlists is part of a playlist set of user interfaces, which may include two or more playlist user interfaces, such as  906  and  908 . 
     In response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the artist list affordance (e.g.,  904 B), the device ceases display of the navigation screen (e.g.,  904 ) and displays an artist user interface (e.g.,  910 ) of two or more artist user interfaces (e.g.,  910 ,  912 ,  914 ). For example, the device receives a touch associated with artist list affordance  904 B, and in response displays a list of artists, illustrated by user interface  910 . The list of artists is part of an artist set of user interfaces, which may include two or more artist user interfaces, such as  910 ,  912 , and  914 . 
     In response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the song list affordance (e.g.,  904 C), the device ceases display of the navigation screen (e.g.,  904 ) and displays a song user interface (e.g.,  916 ) of one or more song user interfaces (e.g.,  916 ). For example, the device receives a touch associated with song list affordance  904 C, and in response displays a list of songs, illustrated by user interface  916 . The list of songs is part of a songs set of user interfaces, which may include one or more song user interfaces, such as  914 . 
     In accordance with some embodiments, while displaying one (e.g.,  906 ) of the two or more playlist user interfaces (e.g.,  906 ,  908 ), the device receives one or more playlist navigation inputs (e.g., activation of a playlist at  906 , activation of a back functionality at  908  to return to  906 ). In response to receiving the one or more playlist navigation inputs, the device transitions one or more times among each of the two or more playlist user interfaces (e.g.,  906  and  908 ) to display a last-displayed playlist user interface (e.g.,  908 ) of the two or more playlist user interfaces (e.g.,  906 ,  908 ). While displaying the last-displayed playlist user interface (e.g.,  908 ), the device receives a first directional swipe. In response to receiving the first directional swipe and in accordance with a determination that the first directional swipe represents a swipe in a first direction, the device ceases display of the last-displayed playlist user interface (e.g.,  908 ) and displays the artist user interface (e.g.,  910 ) of the two or more artist user interfaces (e.g.,  910 ,  912 ,  914 ). While displaying the artist user interface (e.g.,  910 ) of the two or more artist user interfaces (e.g.,  910 ,  912 ,  914 ), the device receives a second directional swipe. In response to receiving the second directional swipe (e.g., in the opposite direction of the first directional swipe), the device ceases display of the artist user interface (e.g.,  910 ) of the two or more artist user interfaces (e.g.,  910 ,  912 ,  914 ) and displays the last-displayed playlist user interface (e.g.,  908 ) of the two or more playlist user interfaces (e.g.,  906 ,  908 ). As an example, the device allows swipe navigation from the playlist user interfaces to the artist user interfaces, and then allows return to the playlist user interfaces with memory of last-displayed playlist user interface. By displaying the last-displayed playlist user interface, navigation is user-friendly and intuitive. For example, the device receives user input at a list of playlists, illustrated by user interface  906 , associated with a playlist “Relax”, represented by affordance  906 B. As a result, the device displays user interface  908 , which illustrates a list of songs associated with the playlist “Relax”. At user interface  908 , the last-displayed playlist user interface, the device receives a directional swipe and displays a list of artists, illustrated by user interface  910 . At the display of any artist user interface (e.g.,  910 ,  912 , or  914 ), if the device receives a subsequent directional swipe that navigates back to the playlist user interfaces (e.g.,  906 ,  908 ), the device then displays the last-displayed playlist user interface, user interface  908  in this example. In some examples, the device may receive any number of navigations between playlist user interfaces (e.g.,  906 ,  908 ). Likewise, the device may receive any number of navigations between artist user interfaces (e.g.,  910 ,  912 ,  914 ). Any playlist user interface (e.g.,  906  or  908 ) may be the last-displayed playlist user interface. 
     In accordance with some embodiments, while displaying one (e.g.,  906 ) of the two or more playlist user interfaces (e.g.,  906 ,  908 ), the device receives one or more playlist navigation inputs. In response to receiving the one or more playlist navigation inputs, the device transitions one or more times among each of the two or more playlist user interfaces (e.g.,  906 ,  908 ) to display a last-displayed playlist user interface (e.g.,  906 ) of the two or more playlist user interfaces (e.g.,  906 ,  908 ). While displaying the last-displayed playlist user interface (e.g.,  906 ), the device receives a third directional swipe. In response to receiving the third directional swipe and in accordance with a determination that the third directional swipe represents a swipe in a second direction (e.g., different from the first direction), the device ceases display of the last-displayed playlist user interface (e.g.,  906 ) and displays the song user interface (e.g.,  916 ) of the one or more song user interfaces (e.g.,  916 ). While displaying the song user interface (e.g.,  916 ) of the one or more song user interfaces (e.g.,  916 ), the device receives a fourth directional swipe. In response to receiving the fourth directional swipe, the device ceases display of the song user interface (e.g.,  916 ) of the one or more song user interfaces (e.g.,  916 ) and displays the last-displayed playlist user interface (e.g.,  906 ) of the two or more playlist user interfaces (e.g.,  906 ,  908 ). Thus, the device allows swiping from playlist user interfaces (e.g.,  906 ,  908 ) to song user interfaces (e.g.,  916 ), and back again, with memory of the last-displayed playlist user interface. 
     In accordance with some embodiments, the device receives a third user input representing movement of the rotatable input mechanism in a second rotation direction (e.g., different than the first). In response to receiving the third user input, the device displays the audio playback user interface (e.g.,  902 ). 
     In accordance with some embodiments, the audio playback user interface (e.g.,  902 ) comprises an affordance (e.g.,  902 A) for initiating audio playback. For example, a “now playing” screen contains a play/pause affordance, represented by affordance  902 A. 
     In accordance with some embodiments, one playlist user interface (e.g.,  908 ) of the two or more playlist user interfaces (e.g.,  906 ,  908 ) comprises an affordance (e.g.,  908 A) which, when selected, causes the audio playback user interface (e.g.,  918 ) to be displayed. One artist user interface (e.g.,  914 ) of the two or more artist user interfaces (e.g.,  910 ,  912 ,  914 ) comprises an affordance (e.g.,  914 A) which, when selected, causes the audio playback user interface (e.g.,  918 ) to be displayed. At least one song user interface (e.g.,  916 ) of the one or more song user interfaces (e.g.,  916 ) comprises an affordance (e.g.,  916 C) which, when selected, causes the audio playback user interface to be displayed (e.g.,  918 ). For example, a song user interface, illustrated by user interface  916 , contains affordance  916 C corresponding to the song “Approve My Eye” by Atom Band. Upon receiving selection of affordance  916 C, the device displays the “now playing” screen illustrated by user interface  918 , which reflects the song selection “Approve My Eye” by Atom Band. 
       FIG. 10  is a flow diagram illustrating an exemplary process for accessing and playing music in accordance with some embodiments. In some embodiments, method  1000  may be performed at an electronic device with a display (e.g.,  112 ,  340 ,  504 ) and a rotatable input mechanism (e.g.,  506 ). In some embodiments, the electronic device also includes a touch-sensitive surface (e.g.,  112 ,  355 ,  504 ). Some operations in method  1000  may be combined, the order of some operations may be changed, and some operations may be omitted. 
     In some embodiments, the touch-sensitive surface (e.g.,  112 ,  355 ,  504 ) is capable of detecting intensity of touch contacts. Exemplary devices that may perform method  1000  include devices  100 ,  300 , and  500  ( FIGS. 1A, 3, and 5A ). 
     Method  1000  provides an intuitive way to access and play music. The method reduces the cognitive burden on a user when using a device to access and play music, thereby creating a more efficient human-machine interface. For battery-operated computing devices, enabling a user to access and play music more quickly and more efficiently conserves power and increases the time between battery charges. 
     At block  1002 , an audio playback user interface (e.g.,  902 ) is displayed. 
     At block  1004 , a first user input representing movement of the rotatable input mechanism in a rotation direction is received. 
     At block  1006 , in response to receiving the first user input representing the movement of the rotatable input mechanism in the rotation direction, display of the audio playback user interface (e.g.,  902 ) is ceased and a navigation screen (e.g.,  904 ) is displayed, wherein the navigation screen (e.g.,  904 ) includes a playlist affordance (e.g.,  904 A), an artist list affordance (e.g.,  904 B), and a song list affordance (e.g.,  904 C). 
     At block  1008 , a second user input (e.g., a touch) associated with the navigation screen (e.g.,  904 ) is received. 
     At block  1010 , it is determined whether the second user input represents a contact on the touch-sensitive surface (e.g., a touch) and is associated with the playlist affordance (e.g.,  904 A), the artist list affordance (e.g.,  904 B), or the song list affordance (e.g.,  904 C). 
     At block  1012 , in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the playlist affordance (e.g.,  904 A), display of the navigation screen (e.g.,  904 ) is ceased and a first playlist user interface (e.g.,  906 ) of two or more playlist user interfaces (e.g.,  906 ,  908 ) is displayed. 
     At block  1014 , in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the artist list affordance (e.g.,  904 B), display of the navigation screen (e.g.,  904 ) is ceased and an artist user interface (e.g.,  910 ) of two or more artist user interfaces (e.g.,  910 ,  912 ,  914 ) is displayed. 
     At block  1016 , in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the song list affordance (e.g.,  904 C), display of the navigation screen (e.g.,  904 ) is ceased and a song user interface (e.g.,  916 ) of one or more song user interfaces (e.g.,  916 ) is displayed. 
     In accordance with some embodiments, while displaying one (e.g.,  906 ) of the two or more playlist user interfaces (e.g.,  906 ,  908 ), one or more playlist navigation inputs is received. In response to receiving the one or more playlist navigation inputs, transitions are made one or more times among each of the two or more playlist user interfaces (e.g.,  906  and  908 ) to display a last-displayed playlist (e.g.,  908 ) user interface of the two or more playlist user interfaces (e.g.,  906 ,  908 ). While displaying the last-displayed playlist user interface (e.g.,  908 ), a first directional swipe is received. In response to receiving the first directional swipe and in accordance with a determination that the first directional swipe represents a swipe in a first direction, display of the last-displayed playlist user interface (e.g.,  908 ) is ceased and the artist user interface (e.g.,  910 ) of the two or more artist user interfaces (e.g.,  910 ,  912 ,  914 ) is displayed. While displaying the artist user interface (e.g.,  910 ) of the two or more artist user interfaces (e.g.,  910 ,  912 ,  914 ), a second directional swipe is received. In response to receiving the second directional swipe, display of the artist user interface (e.g.,  910 ) of the two or more artist user interfaces (e.g.,  910 ,  912 ,  914 ) is ceased and the last-displayed playlist user interface (e.g.,  908 ) of the two or more playlist user interfaces (e.g.,  906 ,  908 ) is displayed. 
     In accordance with some embodiments, while displaying one (e.g.,  906 ) of the two or more playlist user interfaces (e.g.,  906 ,  908 ), one or more playlist navigation inputs is received. In response to receiving the one or more playlist navigation inputs, transitions are made one or more times among each of the two or more playlist user interfaces (e.g.,  906 ,  908 ) to display a last-displayed playlist user interface (e.g.,  906 ) of the two or more playlist user interfaces (e.g.,  906 ,  908 ). While displaying the last-displayed playlist user interface (e.g.,  906 ), a third directional swipe is received. In response to receiving the third directional swipe and in accordance with a determination that the third directional swipe represents a swipe in a second direction (e.g., different than the first direction), display of the last-displayed playlist user interface (e.g.,  906 ) is ceased and the song user interface (e.g.,  916 ) of the one or more song user interfaces (e.g.,  916 ) is displayed. While displaying the song user interface (e.g.,  916 ) of the one or more song user interfaces (e.g.,  916 ), a fourth directional swipe is received. In response to receiving the fourth directional swipe, display of the song user interface (e.g.,  916 ) of the one or more song user interfaces (e.g.,  916 ) is ceased and the last-displayed playlist user interface (e.g.,  906 ) of the two or more playlist user interfaces (e.g.,  906 ,  908 ) is displayed. 
     In accordance with some embodiments, a third user input representing movement of the rotatable input mechanism in a second rotation direction (e.g., different from the first) is received. In response to receiving the third user input, the audio playback user interface (e.g.,  902 ) is displayed. 
     In accordance with some embodiments, the audio playback user interface (e.g.,  902 ) comprises an affordance (e.g.,  902 A) for initiating audio playback. 
     In accordance with some embodiments, one playlist user interface (e.g.,  908 ) of the two or more playlist user interfaces (e.g.,  906 ,  908 ) comprises an affordance (e.g.,  908 A) which, when selected, causes the audio playback user interface (e.g.,  918 ) to be displayed. One artist user interface (e.g.,  914 ) of the two or more artist user interfaces (e.g.,  910 ,  912 ,  914 ) comprises an affordance (e.g.,  914 A) which, when selected, causes the audio playback user interface (e.g.,  918 ) to be displayed. One song user interface (e.g.,  916 ) of the one or more song user interfaces (e.g.,  916 ) comprises an affordance (e.g.,  916 C) which, when selected, causes the audio playback user interface to be displayed (e.g.,  918 ). 
       FIGS. 11A-11C  illustrate exemplary user interfaces for accessing music using an electronic device, in accordance with some embodiments. In some embodiments, the electronic device is device  500 . The electronic device has a display (e.g.,  112 ,  340 ,  504 ), a touch-sensitive surface (e.g.,  112 ,  355 ,  504 ), and a rotatable input mechanism (e.g.,  506 ). 
       FIG. 11A  illustrates a high-level view of the organization of various user interface screens. These and additional user interface screens will be described in further detail with respect to  FIGS. 11B-11C . User interface screen  1102  includes an audio playback user interface of a music application (e.g., a digital music player application). Upon receiving one or more user inputs, the device may provide access from user interface  1102  to user interface  1104 , user interface  1108 , and user interface  1114 . In some embodiments, user interface screen  1102  functions as described with respect to user interface screen  616 , user interface screen  1104  functions as described with respect to user interface screen  604 , user interface screen  1108  functions as described with respect to user interface screen  608 , and user interface screen  1114  functions as described with respect to user interface screen  614 . 
     User interface screen  1104  illustrates playlist selection affordances for accessing various music playlists. Activating a playlist selection affordance causes the device to display user interface screen  1106 . User interface screen  1106  illustrates song selection affordances of the activated playlist. Activating a song selection affordance causes the device to display user interface screen  1102 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. A song selection affordance of user interface  1106  (or other user interfaces with one or more song selection affordances) may also contain an indicator ( 1106 C), which may provide an indication of being stored locally on the electronic device (e.g., the song is available for playback from local memory). In accordance with some embodiments, an indicator ( 1106 C) provides an indication of not being stored locally on the electronic device (e.g., the song is not stored locally, but is available for playback through download or stream from an external electronic device, such as a phone or server). In accordance with some embodiments an indicator ( 1106 C) may provide an indication of not being available for playback (e.g., not stored locally on the electronic and not stored on an external electronic and available for playback through download or stream). In some embodiments, user interface screen  1106  functions as described with respect to user interface screen  606 . 
     User interface screen  1108  illustrates artist selection affordances for accessing music of various artists. Activating an artist selection affordance causes the device to display user interface screen  1110 . User interface screen  1110  illustrates album selection affordances of the activated artist. Activating an album selection affordance causes the device to display user interface screen  1112 , which includes song selection affordances of the selected album of the selected artist. Activating a song selection affordance causes the device to display user interface screen  1102 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. A song selection affordance  1112 A may also contain an indicator  1112 C. In some embodiments, user interface screen  1110  functions as described with respect to user interface screen  610  and user interface screen  1112  functions as described with respect to user interface screen  612 . 
     User interface screen  1114  includes song selection affordances. Activating a song selection affordance causes the device to display user interface screen  1102 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. 
     The audio playback user interface of user interface screen  1102  displays song information (e.g., the title and artist) of an activated (e.g., playing, paused) song. The audio playback user interface of user interface  1102  may contain affordances (e.g.,  1102 A- 1102 F) that, when selected, cause the device to play/pause, skip forward/backward, scrub to within a time in the song, and adjust the volume, among others. Similarly, user interface screen  1116  illustrates an audio playback user interface with affordances  1116 A- 1116 F wherein the interface has been updated, for example, to reflect a newly selected or different song. 
     In some embodiments, as shown in  FIG. 11B , the device displays a first audio playback user interface (e.g.,  1102 ). The device receives user input representing movement (e.g., rotation) of the rotatable input mechanism. 
     In response to receiving the user input representing the movement (e.g., rotation) of the rotatable input mechanism, the device ceases display of the first audio playback user interface (e.g.,  1102 ) and displays a first user interface (e.g.,  1104 ) of a first set of user interfaces (e.g.,  1104 ,  1106 ). For example, in response to rotation of the rotatable input mechanism, the device displays a list of playlists as illustrated by user interface  1104 . Alternatively, another user interface for interacting with a music application may be displayed in response to receiving the movement, such as, for example, user interfaces  1106 ,  1108 ,  1110 ,  1112 , and  1114 . Generally, a set of user interfaces represents one or more user interfaces grouped hierarchically together based on organization or attribute. For example, a set of user interfaces may comprise two user interfaces, one representing a list of playlists (e.g.,  1104 ) and the other representing the songs contained in a playlist selected from this list (e.g.,  1106 ). 
     The device receives a first user input representing a directional swipe on the touch-sensitive surface (e.g., a swipe). The device determines whether the first user input represents a swipe in a first direction or a second direction (e.g., different than the first direction). 
     In response to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the first direction, the device ceases display of the first user interface (e.g.,  1104 ) of the first set of user interfaces (e.g.,  1104 ,  1106 ) and displays a first user interface (e.g.,  1108 ) of a second set of user interfaces (e.g.,  1108 ,  1110 ,  1112 ). For example, the device receives a swipe from right to left at the display of a playlist user interface (e.g.,  1104 ), and in response displays an artist list user interface, illustrated by user interface  1108 . 
     In response to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the second direction (e.g., different than the first direction), the device ceases display of the first user interface (e.g.,  1104 ) of the first set of user interfaces (e.g.,  1104 ,  1106 ) and displays a first user interface (e.g.,  1114 ) of a third set of user interfaces (e.g.,  1114 ). For example, if the device instead receives a swipe from left to right at the display of a playlist user interface (e.g.,  1104 ), the device displays a song list user interface, illustrated by user interface  1114 . 
     In accordance with some embodiments, the device receives a second user input representing a directional swipe on the touch-sensitive surface. In accordance with the determination that the first user input represents a swipe in the first direction, in response to receiving the second user input and in accordance with a determination that the second user input represents a swipe in the first direction, the device ceases display of the second set of user interfaces (e.g.,  1108 ,  1110 , or  1112 ) and displays the first user interface (e.g.,  1114 ) of the third set of user interfaces (e.g.,  1114 ). In accordance with the determination that the first user input represents a swipe in the second direction, in response to receiving the second user input and in accordance with a determination that the second user input represents a swipe in the second direction, the device ceases display of the third set of user interfaces (e.g.,  1114 ) and displays the first user interface (e.g.,  1108 ) of the second set of user interfaces (e.g.,  1108 ,  1110 , or  1112 ). For example, a second consecutive swipe from right to left results in the display of one of the third set of user interfaces, which may be a list of songs as illustrated by user interface  1114 . In contrast, a second consecutive swipe from left to right swipe results in the display of one of the second set of user interfaces, which may be any one of user interfaces  1108 ,  1110 , and  1112 , which collectively represent an artist set of user interfaces. In this manner, the device allows swipe navigation in either direction for access to multiple sets of user interfaces. 
     In accordance with some embodiments, the first user interface (e.g.,  1114 ) of the third set of user interfaces (e.g.,  1114 ) comprises a selection affordance (e.g.,  1114 C). The device receives a third user input (e.g., a touch) associated with the selection affordance (e.g.,  1114 C) of the first user interface (e.g.,  1114 ) of the third set of user interfaces (e.g.,  1114 ). In response to receiving the third user input (e.g., touch), the device ceases display of the first user interface (e.g.,  1114 ) of the third set of user interfaces (e.g.,  1114 ) and displays a second audio playback user interface (e.g.,  1116 ). For example, at a songs list illustrated by user interface  1114 , the device receives a touch associated with affordance  1114 C, associated with the song “Approve My Eye” by Atom Band. As a result of receiving the selection, the device displays a “now playing” screen, illustrated by user interface  1116 , updated to reflect the newly selected song playing. 
     In accordance with some embodiments, the selection affordance (e.g.,  1114 C) of the first user interface (e.g.,  1114 ) of the third set of user interfaces (e.g.,  1114 ) is a song selection affordance. In response to receiving the third user input, the device plays a song associated with the selection affordance (e.g.,  1114 C). 
     In accordance with some embodiments, the selection affordance (e.g.,  1114 A) of the first user interface (e.g.,  1114 ) of the third set of user interfaces (e.g.,  1114 ) is a shuffle all affordance. In response to receiving the third user input, the device plays a song selected at random from a set of songs associated with the selection affordance (e.g.,  1114 A). For example, playing a song entails initiating audio playback of the song; playing a song (or songs) selected at random entails initiating audio playback of the song(s) in a random or pseudo-random order. 
     In accordance with some embodiments, prior to receiving the first user input representing a directional swipe, the device receives user input (e.g., a touch) associated with a selection affordance (e.g.,  1104 B) of the first user interface (e.g.,  1104 ) of the first set of user interfaces (e.g.,  1104 ,  1106 ). In response to receiving the user input (e.g., touch) associated with the selection affordance (e.g.,  1104 B) of the first user interface (e.g.,  1104 ) of the first set of user interfaces (e.g.,  1104 ,  1106 ), the device ceases display of the first user interface (e.g.,  1104 ) of the first set of user interfaces (e.g.,  1104 ,  1106 ) and displays a second user interface (e.g.,  1106 ) of the first set of user interfaces (e.g.,  1104 ,  1106 ). For example, prior to receiving a user swipe navigating away from the playlist set of user interfaces, illustrated by user interfaces  1104  and  1106 , the device allows navigation among the playlist set of user interfaces. The device receives user selection of a playlist “Relax”, represented by affordance  1104 B, and in response displays a list of songs associated with the playlist “Relax”, as illustrated by user interface  1106 . 
     In accordance with some embodiments, the first set of user interfaces, the second set of user interfaces, and the third set of user interfaces are each independently selected from the group consisting of: a playlist set of user interfaces, an artist set of user interfaces, and a songs set of user interfaces. The playlist set of user interfaces comprises: a playlist user interface (e.g.,  1104 ), and a list of songs (e.g.,  1106 ) associated with a playlist of the playlist user interface (e.g.,  1104 ). The artist set of user interfaces comprises: an artist user interface (e.g.,  1108 ), a list of albums (e.g.,  1110 ) associated with an artist of the artist user interface (e.g.,  1108 ), and a list of songs (e.g.,  1112 ) associated with an album of the list of albums (e.g.,  1110 ). The songs set of user interfaces comprises: a song user interface (e.g.,  1114 ). 
       FIG. 12  is a flow diagram illustrating an exemplary process for accessing and playing music in accordance with some embodiments. In some embodiments, method  1200  may be performed at an electronic device with a display (e.g.,  112 ,  340 ,  504 ), a rotatable input mechanism (e.g.,  506 ), and a touch-sensitive surface (e.g.,  112 ,  355 ,  504 ). Some operations in method  1200  may be combined, the order of some operations may be changed, and some operations may be omitted. 
     In some embodiments, the touch-sensitive surface (e.g.,  112 ,  355 ,  504 ) is capable of detecting intensity of touch contacts. Exemplary devices that may perform method  1200  include devices  100 ,  300 , and  500  ( FIGS. 1A, 3, and 5A ). 
     Method  1200  provides an intuitive way to access and play music. The method reduces the cognitive burden on a user when using a device to access and play music, thereby creating a more efficient human-machine interface. For battery-operated computing devices, enabling a user to access and play music more quickly and more efficiently conserves power and increases the time between battery charges. 
     At block  1202 , a first audio playback user interface (e.g.,  1102 ) is displayed. 
     At block  1204 , user input representing movement (e.g., rotation) of the rotatable input mechanism is received. 
     At block  1206 , in response to receiving the user input representing the movement (e.g., rotation) of the rotatable input mechanism, display of the first audio playback user interface (e.g.,  1102 ) is ceased and a first user interface (e.g.,  1104 ) of a first set of user interfaces (e.g.,  1104 ,  1106 ) is displayed. 
     At block  1208 , a first user input representing a directional swipe on the touch-sensitive surface (e.g., a swipe) is received. 
     At block  1210 , it is determined whether the first user input represents a swipe in a first direction or a second direction (e.g., different than the first direction). 
     At block  1212 , in response to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the first direction, display of the first user interface (e.g.,  1104 ) of the first set of user interfaces (e.g.,  1104 ,  1106 ) is ceased and a first user interface (e.g.,  1108 ) of a second set of user interfaces (e.g.,  1108 ,  1110 ,  1112 ) is displayed. 
     At block  1214 , in response to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the second (e.g., different than the first direction) direction, display of the first user interface (e.g.,  1104 ) of the first set of user interfaces (e.g.,  1104 ,  1106 ) is ceased and a first user interface (e.g.,  1114 ) of a third set of user interfaces (e.g.,  1114 ) is displayed. 
     In accordance with some embodiments, a second user input representing a directional swipe on the touch-sensitive surface is received. In accordance with the determination that the first user input represents a swipe in the first direction, in response to receiving the second user input, and in accordance with a determination that the second user input represents a swipe in the first direction, display of the second set of user interfaces (e.g.,  1108 ,  1110 , or  1112 ) is ceased and the first user interface (e.g.,  1114 ) of the third set of user interfaces (e.g.,  1114 ) is displayed. In accordance with the determination that the first user input represents a swipe in the second direction, in response to receiving the second user input, and in accordance with a determination that the second user input represents a swipe in the second direction, display of the third set of user interfaces (e.g.,  1114 ) is ceased and the first user interface (e.g.,  1108 ) of the second set of user interfaces (e.g.,  1108 ,  1110 , or  1112 ) is displayed. 
     In accordance with some embodiments, the first user interface (e.g.,  1114 ) of the third set of user interfaces (e.g.,  1114 ) comprises a selection affordance (e.g.,  1114 C). A third user input associated with the selection affordance (e.g.,  1114 C) of the first user interface (e.g.,  1114 ) of the third set of user interfaces (e.g.,  1114 ) is received. In response to receiving the third user input, display of the first user interface (e.g.,  1114 ) of the third set of user interfaces (e.g.,  1114 ) is ceased and a second audio playback user interface (e.g.,  1116 ) is displayed. 
     In accordance with some embodiments, the selection affordance (e.g.,  1114 C) of the first user interface (e.g.,  1114 ) of the third set of user interfaces (e.g.,  1114 ) is a song selection affordance. In response to receiving the third user input, a song associated with the selection affordance (e.g.,  1114 C) is played. 
     In accordance with some embodiments, the selection affordance (e.g.,  1114 A) of the first user interface (e.g.,  1114 ) of the third set of user interfaces (e.g.,  1114 ) is a shuffle all affordance. In response to receiving the third user input, a song selected at random from a set of songs associated with the selection affordance (e.g.,  1114 A) is played. 
     In accordance with some embodiments, prior to receiving the first user input representing a directional swipe, user input associated with a selection affordance (e.g.,  1104 B) of the first user interface (e.g.,  1104 ) of the first set of user interfaces (e.g.,  1104 ,  1106 ) is received. In response to receiving the user input associated with the selection affordance (e.g.,  1104 B) of the first user interface (e.g.,  1104 ) of the first set of user interfaces (e.g.,  1104 ,  1106 ), display of the first user interface (e.g.,  1104 ) of the first set of user interfaces (e.g.,  1104 ,  1106 ) is ceased and a second user interface (e.g.,  1106 ) of the first set of user interfaces (e.g.,  1104 ,  1106 ) is displayed. 
     In accordance with some embodiments, the first set of user interfaces, the second set of user interfaces, and the third set of user interfaces are each independently selected from the group consisting of: a playlist set of user interfaces, an artist set of user interfaces, and a songs set of user interfaces. The playlist set of user interfaces comprises: a playlist user interface (e.g.,  1104 ), and a list of songs (e.g.,  1106 ) associated with a playlist of the playlist user interface (e.g.,  1104 ). The artist set of user interfaces comprises: an artist user interface (e.g.,  1108 ), a list of albums (e.g.,  1110 ) associated with an artist of the artist user interface (e.g.,  1108 ), and a list of songs (e.g.,  1112 ) associated with an album of the list of albums (e.g.,  1110 ). The songs set of user interfaces comprise: a song user interface (e.g.,  1114 ). 
       FIGS. 13A-13C  illustrate exemplary user interfaces for accessing music using an electronic device, in accordance with some embodiments. In some embodiments, the electronic device is device  500 . The electronic device has a display (e.g.,  112 ,  340 ,  504 ) and a rotatable input mechanism (e.g.,  506 ). 
       FIG. 13A  illustrates a high-level view of the organization of various user interface screens. These and additional user interface screens will be described in further detail with respect to  FIGS. 13B-13C . User interface  1302 , includes an audio playback user interface of a music application (e.g., a digital music player application). Upon receiving one or more user inputs, the device may provide access from user interface  1302  to user interface  1304 , user interface  1308 , and user interface  1314 . In some embodiments, user interface screen  1302  functions as described with respect to user interface screen  604 , user interface screen  1314  functions as described with respect to user interface screen  614 , and user interface screen  1308  functions as described with respect to user interface screen  608 . 
     User interface screen  1304  illustrates playlist selection affordances ( 1304 A- 1304 C) for accessing various music playlists. Activating a playlist selection affordance causes the device to display user interface screen  1306 . User interface screen  1306  illustrates song selection affordances ( 1306 A- 1306 B) of the activated playlist. Activating a song selection affordance causes the device to display user interface screen  1302 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. A song selection affordance of user interface  1306  (or other user interfaces with one or more song selection affordances) may also contain an indicator ( 1306 C), which may provide an indication of being stored locally on the electronic device (e.g., the song is available for playback from local memory). In accordance with some embodiments, an indicator ( 1306 C) provides an indication of not being stored locally on the electronic device (e.g., the song is not stored locally, but is available for playback through download or stream from an external electronic device, such as a phone or server). In accordance with some embodiments an indicator ( 1306 C) may provide an indication of not being available for playback (e.g., not stored locally on the electronic and not stored on an external electronic and available for playback through download or stream). In some embodiments, user interface screen  1306  functions as described with respect to user interface screen  606 , user interface screen  1310  functions as described with respect to user interface screen  610 , user interface screen  1312  functions as described with respect to user interface screen  612 , and user interface screen  1316  functions as described with respect to user interface screen  616 . 
     User interface screen  1308  illustrates artist selection affordances ( 1308 A- 1308 C) for accessing music of various artists. Activating an artist selection affordance causes the device to display user interface screen  1310 . User interface screen  1310  illustrates album selection affordances ( 1310 A- 1310 B) of the activated artist. Activating an album selection affordance causes the device to display user interface screen  1312 , which includes song selection affordances of the selected album of the selected artist. Activating a song selection affordance causes the device to display user interface screen  1302 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. 
     User interface screen  1314  illustrates song selection affordances ( 1314 A- 1314 C). Activating a song selection affordance causes the device to display user interface screen  1302 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. 
     The audio playback user interface of user interface screen  1302  displays song information (e.g., the title and artist) of an activated (e.g., playing, paused) song. The audio playback user interface of user interface  1302  may contain affordances (e.g.,  1302 A- 1302 F) that, when selected, cause the device to play/pause, skip forward/backward, scrub to within a time in the song, and adjust the volume, among others. Similarly, user interface screen  1316  illustrates an audio playback user interface with affordances  1316 A- 1316 F wherein the interface has been updated, for example, to reflect a newly selected or different song. 
     In some embodiments, as shown in  FIG. 13B , the device displays an audio playback user interface (e.g.,  1302 ). The device receives a first user input representing a directional swipe in a first direction (e.g., a swipe from right to left). 
     In response to receiving the first user input, the device ceases display of the audio playback user interface (e.g.,  1302 ) and displays a first user interface (e.g.,  1304 ) of a first set of user interfaces (e.g.,  1304 ,  1306 ), the first user interface (e.g.,  1304 ) of the first set of user interfaces (e.g.,  1304 ,  1306 ) comprising a selection affordance (e.g.,  1304 B). For example, the device may cease display of a “now playing” screen in response to a swipe (from right to left) and display a list of playlists, illustrated by user interface  1304 , which may contain affordances  1304 A- 1304 C for selection of one or more playlists. 
     While displaying a user interface (e.g.,  1304  or  1306 ) of the first set of user interfaces (e.g.,  1304 ,  1306 ), the device receives a second user input representing a directional swipe in a second direction (e.g., different than the first direction) (e.g., a swipe from left to right). 
     In response to receiving the second user input, the device ceases display of the user interface (e.g.,  1304  or  1306 ) of a first set of user interfaces (e.g.,  1304 ,  1306 ) and displays the audio playback user interface (e.g.,  1302 ). For example, the device allows navigation from a “now playing” screen, as illustrated by user interface  1302 , to a playlist set of user interfaces ( 1304  and  1306 ), and back again, using directional swipe inputs received. 
     In accordance with some embodiments, while displaying the first user interface (e.g.,  1304 ) of the first set of user interfaces (e.g.,  1304  or  1306 ), and prior to receiving the second user input (e.g., swipe), the device receives a third user input (e.g., a touch) associated with the selection affordance (e.g.,  1304 B) of the first user interface (e.g.,  1304 ) of the first set of user interfaces (e.g.,  1304 ,  1306 ). In response to receiving the third user input (e.g., touch), the device ceases display of the first user interface (e.g.,  1304 ) of the first set of user interfaces (e.g.,  1304 ,  1306 ) and displays a second user interface (e.g.,  1306 ) of the first set of user interfaces (e.g.,  1304  or  1306 ), the second user interface (e.g.,  1306 ) of the first set of user interfaces (e.g.,  1304 ,  1306 ) comprising a selection affordance (e.g.,  1306 A). For example, the device allows navigation between user interfaces of a set of user interfaces, while maintaining the navigational relationship that the set of affordance has with other sets of affordances or the audio playback user interface. As an example, the device allows selection of a playlist via selection affordance  1304 B, which causes user interface  1306  to be displayed. From user interface  1306 , a list of songs within the playlist associated with selection affordance  1304 B, navigation back to the audio playback user interface is still possible upon receiving the appropriate directional swipe, for example, from left to right. 
     In accordance with some embodiments, the device receives a plurality of directional user inputs (e.g., multiple swipes), wherein the plurality of directional user inputs comprises: a plurality of user inputs representing directional swipes in the first direction (e.g., right to left), and a plurality of user inputs representing directional swipes in the second direction (e.g., left to right). In response to receiving a final user input of the plurality of directional user inputs, the device displays the audio playback user interface (e.g.,  1302 ). For example, regardless of the number and direction of navigation swipes that the device receives for navigation between sets of user interfaces, the audio playback user interface may be accessed. In one example, beginning at user interface  1302 , four directional swipes from right to left may cause the device to display, sequentially in response to each swipe, user interface  1304 , user interface  1308 , user interface  1314 , and then user interface  1302 . Four consecutive swipes in the opposite direction (left to right) would result in the opposite sequence of user interfaces. Any combination of directional swipes may be combined. 
     In accordance with some embodiments, in response to receiving one of the plurality of directional user inputs, the device displays a first user interface (e.g.,  1308 ) of a second set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ), the first user interface (e.g.,  1308 ) of the second set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ) comprising a selection affordance (e.g.,  1308 A). User interface  1308 , which illustrates an artists list, may contain affordances  1308 A,  1308 B, and  1308 C for selection of one or more artists. 
     In accordance with some embodiments, the device receives a fourth user input associated with the selection affordance (e.g.,  1308 A) of the first user interface (e.g.,  1308 ) of the second set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ). In response to receiving the fourth user input, the device ceases display of the first user interface (e.g.,  1308 ) of the second set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ) and displays a second user interface (e.g.,  1310 ) of the second set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ) comprising a selection affordance (e.g.,  1310 A). User interface  1310 , which illustrates an albums list associated with an artist, may contain selection affordances  1310 A- 1310 B for selection of one or more albums associated with an artist. 
     In accordance with some embodiments, the device receives a fifth user input associated with the selection affordance (e.g.,  1310 A) of the second user interface (e.g.,  1310 ) of the second set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ). In response to receiving the fifth user input, the device ceases display of the second user interface (e.g.,  1310 ) of the second set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ) and displays the audio playback user interface (e.g.,  1302 ), wherein the audio playback user interface is updated based on the selection affordance associated with the fifth user input (e.g.,  1310 A). In one example, the device receives user input associated with an album selection affordance  1310 A, and playback of the album is initiated and the audio playback user interface is displayed, updated to reflect this. In another example, the selection affordance associated with the fifth is associated with a song, such as selection affordance  1312 C (associated with “Approve My Eye” by Atom Band), and playback of that song is initiated and user interface  1316  is displayed, illustrating a “now playing” screen. 
     In accordance with some embodiments, the first set of user interfaces, the second set of user interfaces, and the third set of user interfaces are selected from the group comprising: a playlist set of user interfaces (e.g.,  1304 ,  1306 ), an artist set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ), and a songs set of user interfaces (e.g.,  1314 ); the playlist set of user interfaces comprises: a playlist user interface (e.g.,  1304 ), and a list of songs (e.g.,  1306 ) associated with a playlist of the playlist user interface; the artist set of user interfaces comprises: an artist user interface (e.g.,  1308 ), a list of albums (e.g.,  1310 ) associated with an artist of the artist user interface (e.g.,  1308 ), and a list of songs (e.g.,  1312 ) associated with an album of the list of albums (e.g.,  1310 ); and the songs set of user interfaces comprises: a song user interface (e.g.,  1314 ). 
       FIG. 14  is a flow diagram illustrating an exemplary process for accessing and playing music in accordance with some embodiments. In some embodiments, method  1400  may be performed at an electronic device with a display (e.g.,  112 ,  340 ,  504 ) and a rotatable input mechanism (e.g.,  506 ). In some embodiments, the electronic device also includes a touch-sensitive surface (e.g.,  112 ,  355 ,  504 ). Some operations in method  1400  may be combined, the order of some operations may be changed, and some operations may be omitted. 
     In some embodiments, the touch-sensitive surface (e.g.,  112 ,  355 ,  504 ) is capable of detecting intensity of touch contacts. Exemplary devices that may perform method  1400  include devices  100 ,  300 , and  500  ( FIGS. 1A, 3, and 5A ). 
     Method  1400  provides an intuitive way to access and play music. The method reduces the cognitive burden on a user when using a device to access and play music, thereby creating a more efficient human-machine interface. For battery-operated computing devices, enabling a user to access and play music more quickly and more efficiently conserves power and increases the time between battery charges. 
     At block  1402 , an audio playback user interface (e.g.,  1302 ) is displayed. 
     At block  1404 , a first user input representing a directional swipe in a first direction is received. 
     At block  1406 , in response to receiving the first user input, the display of the audio playback user interface (e.g.,  1302 ) is ceased and a first user interface (e.g.,  1304 ) of a first set of user interfaces (e.g,  1304 ,  1306 ), the first user interface (e.g.,  1304 ) of the first set of user interfaces (e.g,  1304 ,  1306 ) comprising a selection affordance (e.g.,  1304 B) is displayed. 
     At block  1408 , while displaying a user interface (e.g.,  1304  or  1306 ) of the first set of user interfaces (e.g.,  1304 ,  1306 ), a second user input representing a directional swipe in a second direction (e.g., different than the first direction) is received. 
     At block  1410 , in response to receiving the second user input, the display of the user interface (e.g.,  1304  or  1306 ) of a first set of user interfaces (e.g.,  1304 ,  1306 ) is ceased and the audio playback user interface (e.g.,  1302 ) is displayed. 
     In accordance with some embodiments, while displaying the first user interface (e.g.,  1304 ) of the first set of user interfaces (e.g.,  1304  or  1306 ), and prior to receiving the second user input, a third user input associated with the selection affordance (e.g.,  1304 B) of the first user interface (e.g.,  1304 ) of the first set of user interfaces (e.g.,  1304 ,  1306 ) is received. In response to receiving the third user input, the display of the first user interface (e.g.,  1304 ) of the first set of user interfaces (e.g.,  1304 ,  1306 ) is ceased and a second user interface (e.g.,  1306 ) of the first set of user interfaces (e.g.,  1304  or  1306 ) is displayed, the second user interface (e.g.,  1306 ) of the first set of user interfaces (e.g.,  1304 ,  1306 ) comprising a selection affordance (e.g.,  1306 A). 
     In accordance with some embodiments, a plurality of directional user inputs is received, wherein the plurality of directional user inputs comprises: a plurality of user inputs representing directional swipes in the first direction, and a plurality of user inputs representing directional swipes in the second direction. In response to receiving a final user input of the plurality of directional user inputs, the audio playback user interface (e.g.,  1302 ) is displayed. 
     In accordance with some embodiments, in response to receiving one of the plurality of directional user inputs, a first user interface (e.g.,  1308 ) of a second set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ) is displayed, the first user interface (e.g.,  1308 ) of the second set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ) comprising a selection affordance (e.g.,  1308 A). User interface  1308 , which illustrates an artists list, may contain affordances  1308 A,  1308 B, and  1308 C for selection of one or more artists. 
     In accordance with some embodiments, a fourth user input associated with the selection affordance (e.g.,  1308 A) of the first user interface (e.g.,  1308 ) of the second set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ) is received. In response to receiving the fourth user input, the display of the first user interface (e.g.,  1308 ) of the second set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ) is ceased and a second user interface (e.g.,  1310 ) of the second set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ) is displayed, comprising a selection affordance (e.g.,  1310 A). User interface  1310 , which illustrates an albums list associated with an artist, may contain selection affordances  1310 A- 1310 B for selection of one or more albums associated with an artist. 
     In accordance with some embodiments, a fifth user input associated with the selection affordance (e.g.,  1310 A) of the second user interface (e.g.,  1310 ) of the second set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ) is received. In response to receiving the fifth user input, the display of the second user interface (e.g.,  1310 ) of the second set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ) is ceased and the audio playback user interface (e.g.,  1302 ) is displayed, wherein the audio playback user interface is updated based on the selection affordance associated with the fifth user input (e.g.,  1310 A). In one example, the device receives user input associated with an album selection affordance  1310 A, and playback of the album is initiated and the audio playback user interface is displayed, updated to reflect this. In another example, the selection affordance associated with the fifth is associated with a song, such as selection affordance  1312 C (associated with “Approve My Eye” by Atom Band), and playback of that song is initiated. 
     In accordance with some embodiments, the first set of user interfaces (e.g.,  1304 ,  1306 ), the second set of user interfaces (e.g.,  1308 ,  1310 ,  1312 ), and the third set of user interfaces (e.g.,  1314 ) are selected from the group comprising: a playlist set of user interfaces, an artist set of user interfaces, and a songs set of user interfaces; the playlist set of user interfaces comprises: a playlist user interface, and a list of songs associated with a playlist of the playlist user interface; the artist set of user interfaces comprises: an artist user interface, a list of albums associated with an artist of the artist user interface, and a list of songs associated with an album of the list of albums; and the songs set of user interfaces comprises: a song user interface. 
       FIGS. 15A-15C  illustrate exemplary user interfaces for accessing music using an electronic device, in accordance with some embodiments. In some embodiments, the electronic device is device  500 . The electronic device has a display (e.g.,  112 ,  340 ,  504 ), a touch-sensitive surface (e.g.,  112 ,  355 ,  504 ), and may have a rotatable input mechanism (e.g.,  506 ). 
       FIG. 15A  illustrates a high-level view of the organization of various user interface screens. These and additional user interface screens will be described in further detail with respect to  FIG. 15B . User interface screen  1502 , includes an audio playback user interface of a music application (e.g., a digital music player application). Upon receiving one or more user inputs, the device may provide access from user interface  1502  to user interface  1504 , user interface  1508 , and user interface  1514 . In some embodiments, user interface screen  1502  functions as described with respect to user interface screen  616 , user interface screen  1504  functions as described with respect to user interface screen  604 , user interface screen  1508  functions as described with respect to user interface screen  608 , and user interface screen  1514  functions as described with respect to user interface screen  614 . 
     User interface screen  1504  illustrates playlist selection affordances ( 1504 A- 1504 C) for accessing various music playlists. Activating a playlist selection affordance causes the device to display user interface screen  1506 . User interface screen  1506  illustrates song selection affordances ( 1506 A- 1506 B) of the activated playlist. Activating a song selection affordance causes the device to display user interface screen  1502 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. A song selection affordance of user interface  1506  (or other user interfaces with one or more song selection affordances) may also contain an indicator ( 1506 C), which may provide an indication of being stored locally on the electronic device (e.g., the song is available for playback from local memory). In accordance with some embodiments, an indicator ( 1506 C) provides an indication of not being stored locally on the electronic device (e.g., the song is not stored locally, but is available for playback through download or stream from an external electronic device, such as a phone or server). In accordance with some embodiments an indicator ( 1506 C) may provide an indication of not being available for playback (e.g., not stored locally on the electronic and not stored on an external electronic and available for playback through download or stream). In some embodiments, user interface screen  1506  functions as described with respect to user interface screen  606 . 
     User interface screen  1508  illustrates artist selection affordances ( 1508 A- 1508 C) for accessing music of various artists. Activating an artist selection affordance causes the device to display user interface screen  1510 . User interface screen  1510  illustrates album selection affordances ( 1510 A- 1510 B) of the activated artist. Activating an album selection affordance causes the device to display user interface screen  1512 , which includes song selection affordances ( 1512 A- 1512 B) of the selected album of the selected artist. Activating a song selection affordance causes the device to display user interface screen  1502 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. User interface  1512  may also contain indicator  1512 C, which may indicate whether an audio file is available locally for playback. In some embodiments, user interface screen  1510  functions as described with respect to user interface screen  610  and user interface screen  1512  functions as described with respect to user interface screen  612 . 
     User interface screen  1514  illustrates song selection affordances ( 1514 A- 1514 C). Activating a song selection affordance causes the device to display user interface screen  1502 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. 
     The audio playback user interface of user interface screen  1502  displays song information (e.g., the title and artist) of an activated (e.g., playing, paused) song. The audio playback user interface of user interface  1502  may contain affordances (e.g.,  1502 A- 1502 F) that, when selected, cause the device to play/pause, skip forward/backward, scrub to within a time in the song, and adjust the volume, among others. 
     In some embodiments, as shown in  FIG. 15B , the device displays an audio playback user interface (e.g.,  1502 ). While displaying the audio playback user interface (e.g.,  1502 ), the device receives user input representing a first contact (e.g., touch) on the touch-sensitive surface. Similarly, user interface screen  1518  illustrates an audio playback user interface with affordances  1518 A- 1518 F wherein the interface has been updated, for example, to reflect a newly selected or different song. 
     The device determines whether a characteristic intensity of the first contact exceeds an intensity threshold. 
     In accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold, the device ceases display of the audio playback user interface (e.g.,  1502 ) and displays a first set of affordances (e.g.,  1516 A- 1516 D). For example, if the device receives a deep press at a “now playing” screen, the device displays user interface  1516 . User interface  1516  may contain an affordance for browsing music ( 1516 A), for shuffling ( 1516 B), an affordance for repeating ( 1516 C), an affordance for creating a station ( 1516 D), and the like. If the device receives a light press, the device performs an action based on the location of the light press (e.g., by activating the appropriate affordance). 
     The device receives user input representing a second contact (e.g., touch) associated with an affordance (e.g.,  1516 A) of the first set of affordances (e.g.,  1516 A- 1516 D). For example, the device receives a touch associated with the “browse music” affordance represented by affordance  1516 A. 
     In response to receiving the second contact, the device ceases display of the first set of affordances (e.g.,  1516 A- 1516 D) and displays a first user interface (e.g.,  1504 ) of a first set of user interfaces (e.g.,  1504 ,  1506 ). For example, in response to receiving selection of “browse music” affordance  1516 A, the device displays a playlist selection user interface (e.g., list of playlists), illustrated by user interface  1504 . Other user interfaces, such as  1508  or  1514 , may be displayed upon selection of a “browse music” affordance, for example. 
     In accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold (e.g., not a deep press), the device forgoes display of the first set of affordances (e.g.,  1516 A- 1516 D). 
     In accordance with some embodiments, the determination that the characteristic intensity of the first contact exceeds the intensity threshold is independent of a location of the first contact on the touch-sensitive surface. For example, the determination that the user input represents a deep press may not require that the input be associated with any particular affordance or location on the touch-sensitive surface. 
     In accordance with some embodiments, while displaying the first user interface (e.g.,  1504 ) of the first set of user interfaces (e.g.,  1504 ,  1506 ), the device receives user input representing a first swipe in a first direction (e.g., a swipe from right to left). In response to receiving the first swipe in the first direction (e.g., a swipe from right to left), the device ceases display of the first user interface (e.g.,  1504 ) of a first set of user interfaces (e.g.,  1504 ,  1506 ) and displays a first user interface (e.g.,  1508 ) of a second set of user interfaces (e.g.,  1508 ,  1510 ,  1512 ). For example, the device receives a swipe from right to left and in response displays a list of artists, as illustrated by user interface  1508 . In another example, the device may receive a swipe from left to right and instead display a list of songs, as illustrated by user interface  1514 . 
     In accordance with some embodiments, while displaying the first user interface (e.g.,  1508 ) of the second set of user interfaces (e.g.,  1508 ,  1510 ,  1512 ), the device receives user input representing a second swipe in the first direction. In response to receiving the second swipe, the device ceases display of the first user interface (e.g.,  1508 ) of a second set of user interfaces (e.g.,  1508 ,  1510 ,  1512 ) and displays a first user interface (e.g.,  1514 ) of a third set of user interfaces (e.g.,  1514 ). For example, the device receives a swipe from right to left and in response displays a songs list, as illustrated by user interface  1514 . 
     In accordance with some embodiments, while displaying the first user interface (e.g.,  1504 ) of the first set of user interfaces (e.g.,  1504 ,  1506 ), the device receives user input representing a third contact (e.g., a touch) associated with an affordance (e.g.,  1504 B) of the first user interface (e.g.,  1504 ) of the first set of user interfaces (e.g.,  1504 ,  1506 ). In response to receiving the third contact (e.g., a touch), the device ceases display of the first user interface (e.g.,  1504 ) of a first set of user interfaces (e.g.,  1504 ,  1506 ) and displays a second user interface (e.g.,  1506 ) of the first set of user interfaces (e.g.,  1504 ,  1506 ). For example, the device receives user selection (e.g., by a touch) of an affordance associated with the playlist “Relax”, represented by affordance  1504 B, at a playlist user interface, illustrated by user interface  1504 . Upon receiving selection, the device displays the songs associated with the playlist “Relax”, illustrated by affordances  1506 A- 1506 B of user interface  1506 . 
     In accordance with some embodiments, while displaying a user interface (e.g.,  1504  or  1506 ) of a set of user interfaces (e.g.,  1504 ,  1506 ), the device receives user input representing a fourth contact on the touch-sensitive surface. The device determines whether a characteristic intensity of the fourth contact exceeds a second intensity threshold. In accordance with a determination that the characteristic intensity of the fourth contact exceeds the second intensity threshold (e.g., a deep press), the device displays a second set of affordances (e.g.,  1536 A- 1536 C). The device receives user input representing a fifth contact (e.g., a touch) associated with an affordance (e.g.,  1536 A) of the second set of affordances (e.g.,  1536 A- 1536 D). In response to receiving the fifth contact (e.g., a touch), the device ceases display of the second set of affordances (e.g.,  1536 A- 1536 D) and displays the audio playback user interface (e.g.,  1502 ). In accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold (e.g., not a deep press), the device forgoes displaying the second set of affordances (e.g.,  1536 A- 1536 D). 
     In accordance with some embodiments, the first set of user interfaces, the second set of user interfaces, and the third set of user interfaces are each independently selected from the group consisting of: a playlist set of user interfaces, an artist set of user interfaces, and a songs set of user interfaces; the playlist set of user interfaces comprises: a playlist user interface (e.g.,  1504 ), and a list of songs (e.g.,  1506 ) associated with a playlist of the playlist user interface (e.g.,  1504 ); wherein the artist set of user interfaces comprises: an artist user interface (e.g.,  1508 ), a list of albums (e.g.,  1510 ) associated with an artist of the artist user interface (e.g.,  1508 ), and a list of songs (e.g.,  1512 ) associated with an album of the list of albums (e.g.,  1510 ); and wherein the songs set of user interfaces comprises: a song user interface. 
       FIG. 16  is a flow diagram illustrating an exemplary process for accessing and playing music in accordance with some embodiments. In some embodiments, method  1600  may be performed at an electronic device with a display (e.g.,  112 ,  340 ,  504 ) and a touch-sensitive surface (e.g.,  112 ,  355 ,  504 ). In some embodiments, the electronic device also includes a rotatable input mechanism (e.g.,  506 ). Some operations in method  1600  may be combined, the order of some operations may be changed, and some operations may be omitted. 
     In some embodiments, the touch-sensitive surface (e.g.,  112 ,  355 ,  504 ) is capable of detecting intensity of touch contacts. Exemplary devices that may perform method  1600  include devices  100 ,  300 , and  500  ( FIGS. 1A, 3, and 5A ). 
     Method  1600  provides an intuitive way to access and play music. The method reduces the cognitive burden on a user when using a device to access and play music, thereby creating a more efficient human-machine interface. For battery-operated computing devices, enabling a user to access and play music more quickly and more efficiently conserves power and increases the time between battery charges. 
     At block  1602 , an audio playback user interface (e.g.,  1502 ) is displayed. 
     At block  1604 , while displaying the audio playback user interface (e.g.,  1502 ), user input representing a first contact (e.g., touch) on the touch-sensitive surface is received. 
     At block  1606 , it is determined whether a characteristic intensity of the first contact exceeds an intensity threshold. 
     At block  1608 , in accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold (e.g., a deep press), display of the audio playback user interface (e.g.,  1502 ) is ceased and a first set of affordances (e.g.,  1516 A- 1516 D) is displayed. 
     At block  1610 , user input representing a second contact (e.g., touch on a touch-sensitive surface) associated with an affordance (e.g.,  1516 A) of the first set of affordances (e.g.,  1516 A- 1516 D) is received. 
     At block  1612 , in response to receiving the second contact, display of the first set of affordances (e.g.,  1516 A- 1516 D) is ceased and a first user interface (e.g.,  1504 ) of a first set of user interfaces (e.g.,  1504 ,  1506 ) is displayed. 
     At block  1614 , in accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold (e.g., not a deep press), display of the first set of affordances (e.g.,  1516 A- 1516 D) is forgone. 
     In accordance with some embodiments, the determination that the characteristic intensity of the first contact exceeds the intensity threshold is independent of a location of the first contact on the touch-sensitive surface. 
     In accordance with some embodiments, while displaying the first user interface (e.g.,  1504 ) of the first set of user interfaces (e.g.,  1504 ,  1506 ), user input representing a first swipe in a first direction is received. In response to receiving the first swipe in the first direction (e.g., a swipe to the left or the right), display of the first user interface (e.g.,  1504 ) of a first set of user interfaces (e.g.,  1504 ,  1506 ) is ceased and a first user interface (e.g.,  1508 ) of a second set of user interfaces (e.g.,  1508 ,  1510 ,  1512 ) is displayed. 
     In accordance with some embodiments, while displaying the first user interface (e.g.,  1508 ) of the second set of user interfaces (e.g.,  1508 ,  1510 ,  1512 ), user input representing a second swipe in the first direction is received. In response to receiving the second swipe, display of the first user interface (e.g.,  1508 ) of a second set of user interfaces (e.g.,  1508 ,  1510 ,  1512 ) is ceased and a first user interface (e.g.,  1514 ) of a third set of user interfaces (e.g.,  1514 ) is displayed. 
     In accordance with some embodiments, while displaying the first user interface (e.g.,  1504 ) of the first set of user interfaces (e.g.,  1504 ,  1506 ), user input representing a third contact associated with an affordance (e.g.,  1504 B) of the first user interface (e.g.,  1504 ) of the first set of user interfaces (e.g.,  1504 ,  1506 ) is received. In response to receiving the third contact, display of the first user interface (e.g.,  1504 ) of a first set of user interfaces (e.g.,  1504 ,  1506 ) is ceased and a second user interface (e.g.,  1506 ) of the first set of user interfaces (e.g.,  1504 ,  1506 ) is displayed. 
     In accordance with some embodiments, while displaying a user interface (e.g.,  1504  or  1506 ) of a set of user interfaces (e.g.,  1504 ,  1506 ), user input representing a fourth contact on the touch-sensitive surface is received. It is determined whether a characteristic intensity of the fourth contact exceeds a second intensity threshold. In accordance with a determination that the characteristic intensity of the fourth contact exceeds the second intensity threshold (e.g., a deep press), a second set of affordances (e.g.,  1536 A- 1536 D) is displayed. User input representing a fifth contact associated with an affordance (e.g.,  1536 A) of the second set of affordances (e.g.,  1536 A- 1536 D) is received. In response to receiving the fifth contact, display of the second set of affordances (e.g.,  1536 A- 1536 D) is ceased and the audio playback user interface (e.g.,  1502 ) is displayed. In accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold (e.g., not a deep press), display of the second set of affordances (e.g.,  1536 A- 1536 D) is forgone. 
       FIGS. 17A-17C  illustrate exemplary user interfaces for accessing music using an electronic device, in accordance with some embodiments. In some embodiments, the electronic device is device  500 . The electronic device has a display (e.g.,  112 ,  340 ,  504 ), a touch-sensitive surface (e.g.,  112 ,  355 ,  504 ), and a rotatable input mechanism (e.g.,  506 ). 
       FIG. 17A  illustrates a high-level view of the organization of various user interface screens. These and additional user interface screens will be described in further detail with respect to  FIGS. 17B-17C . User interface screen  1702  illustrates an audio playback user interface (e.g., a screen displayed when audio playback is initiated) of a music application (e.g., a digital music player application). Upon receiving one or more user inputs, the device may provide access from user interface screen  1702  to user interface screen  1704 , user interface screen  1708 , and user interface screen  1714 . In some embodiments, user interface screen  1702  functions as described with respect to user interface screen  616 , user interface screen  1704  functions as described with respect to user interface screen  604 , user interface screen  1708  functions as described with respect to user interface screen  608 , and user interface screen  1714  functions as described with respect to user interface screen  614 . 
     User interface screen  1704  illustrates playlist selection affordances ( 1704 A- 1704 C) for accessing various music playlists. Activating a playlist selection affordance causes the device to display user interface screen  1706 . User interface screen  1706  illustrates song selection affordances ( 1706 A- 1706 B) of the activated playlist. At user interface screen  1706 , activating a song selection affordance causes the device to display user interface screen  1702 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. A song selection affordance of user interface  1706  (or other user interfaces with one or more song selection affordances) may also contain an indicator ( 1706 C), which may provide an indication of being stored locally on the electronic device (e.g., the song is available for playback from local memory). In accordance with some embodiments, an indicator ( 1706 C) provides an indication of not being stored locally on the electronic device (e.g., the song is not stored locally, but is available for playback through download or stream from an external electronic device, such as a phone or server). In accordance with some embodiments an indicator ( 1706 C) may provide an indication of not being available for playback (e.g., not stored locally on the electronic and not stored on an external electronic and available for playback through download or stream). In some embodiments, user interface screen  1706  functions as described with respect to user interface screen  606 . 
     User interface screen  1708  illustrates artist selection affordances ( 1708 A- 1708 C) for accessing music of various artists. Activating an artist selection affordance causes the device to display user interface screen  1710 . User interface screen  1710  illustrates album selection affordances ( 1710 A- 1710 B) of the activated artist. Activating an album selection affordance causes the device to display user interface screen  1712 , which includes song selection affordances ( 1712 A- 1712 B) of the selected album of the selected artist. Activating a song selection affordance causes the device to display user interface screen  1702 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. In some embodiments, user interface screen  1710  functions as described with respect to user interface screen  610  and user interface screen  1712  functions as described with respect to user interface screen  612 . 
     User interface screen  1714  illustrates song selection affordances ( 1714 A- 1714 C). Activating a song selection affordance causes the device to display user interface screen  1702 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. 
     The audio playback user interface of user interface screen  1702  displays song information (e.g., the title and artist) of an activated (e.g., playing, paused) song. The audio playback user interface of user interface  1702  may contain affordances (e.g.,  1702 A- 1702 F) that, when selected, cause the device to play/pause, skip forward/backward, scrub to within a time in the song, and adjust the volume, among others. Similarly, user interface screen  1718  illustrates an audio playback user interface with affordances  1718 A- 1718 F wherein the interface has been updated, for example, to reflect a newly selected or different song. 
     In some embodiments, as shown in  FIG. 17B , the device displays a first audio playback user interface (e.g.,  1702 ). For example, the device displays user interface  1702 , which illustrates an audio playback user interface, or “now playing” screen, which provides an indication of the currently playing audio file (e.g., the currently playing audio file is the song “Across the Land” by artist Awesingers). 
     The device receives user input representing a first movement (e.g., rotation) of the rotatable input mechanism (e.g., the user rotates the rotatable input mechanism). In response to receiving the user input representing the first movement (e.g., rotation) of the rotatable input mechanism, the device ceases display of the first audio playback user interface (e.g.,  1702 ) and displays a first user interface (e.g.,  1704 ) of a first set of user interfaces (e.g.,  1704 ,  1706 ). For example, the device may display user interface  1704 , which illustrates a list of playlists and contains selection affordances  1704 A- 1704 C representing playlists. Generally, a set of user interfaces represents one or more user interfaces grouped hierarchically together based on organization or attribute. For example, a set of user interfaces may comprise two user interfaces, one representing a list of playlists and the other representing the songs contained in a playlist selected from this list. 
     While displaying a user interface (e.g.,  1704  or  1706 ) of the first set of user interfaces (e.g.,  1704 ,  1706 ), the device receives user input representing a first contact (e.g., a touch) on the touch-sensitive surface. 
     The device determines whether a characteristic intensity of the first contact exceeds an intensity threshold. 
     In accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold (e.g., a deep press), the device ceases display of the first set of user interfaces (e.g.,  1704  or  1706 ) and displays a first set of affordances (e.g.,  1716 A and  1716 B of user interface  1716 ). 
     The device receives user input (e.g., a touch) associated with a first affordance (e.g.,  1716 A) of the first set of affordances (e.g.,  1716 A- 1716 B). Generally, displayed items (e.g., affordances) are associated with user inputs in a contextual manner, such that the user input being received at a location on the touch-sensitive surface corresponding to that of the displayed item causes activation of the displayed item and/or a function associated with it. 
     In response to receiving the user input (e.g., touch) associated with the first affordance (e.g.,  1716 A) of the first set of affordances (e.g.,  1716 A- 1716 B), the device ceases display of the first set of affordances (e.g.,  1716 A- 1716 B) and displays a first user interface (e.g.,  1708 ) of a second set of user interfaces (e.g.,  1708 ,  1710 ,  1712 ). In one example, if the device receives user input associated with affordance  1716 A, which reads “artists”, an artists list is displayed, illustrated by user interface  1708 . If instead, for example, the device receives user input associated with affordance  1716 B, which reads “songs”, a songs list is displayed, illustrated by user interface  1708 . 
     In accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold (e.g., not a deep press), the device forgoes display of the first set of affordances (e.g.,  1716 A- 1716 B). Generally, however, the function associated with the location of contact may be activated (e.g., “shuffle all”). For example, if the device receives a contact (not a deep press) on user interface  1704  at a location corresponding to affordance  1704 B, which corresponds to the playlist titled “Relax”, the device may display a list of songs in the playlist “Relax”. 
     In accordance with some embodiments, while displaying a user interface (e.g.,  1708 ,  1710 , or  1712 ) of the second set of user interfaces (e.g.,  1708 ,  1710 ,  1712 ), the device receives user input representing a second contact (e.g., a touch) on the touch-sensitive surface. The device determines whether a characteristic intensity of the second contact exceeds a second intensity threshold. In accordance with a determination that the characteristic intensity of the second contact exceeds the second intensity threshold (e.g., a deep press), the device ceases display of the second set of user interfaces (e.g.,  1708 ,  1710 , or  1712 ) and displays a second set of affordances (e.g., affordances  1722 A- 1722 B of user interface  1722 ). The device receives user input associated with a first affordance (e.g.,  1722 B) of the second set of affordances (e.g.,  1722 A- 1722 B). In response to receiving the user input associated with the first affordance (e.g.,  1722 B) of the second set of affordances (e.g.,  1722 A- 1722 B), the device ceases display of the second set of affordances (e.g.,  1722 A- 1722 B) and displays a first user interface (e.g.,  1714 ) of a third set of user interfaces (e.g.,  1714 ). In accordance with a determination that the characteristic intensity of the second contact does not exceed the second intensity threshold (e.g., not a deep press), the device forgoes displaying the second set of affordances. For example, the device receives a deep press, and displays a set of affordances (for navigating a music application); selection of one of the affordances  1722 B, which reads “songs”, causes a songs list, as illustrated by user interface  1714 , to be displayed. 
     In accordance with some embodiments, the first user interface (e.g.,  1714 ) of the third set of user interfaces (e.g.,  1714 ) comprises a selection affordance (e.g.,  1714 C). The device receives user input associated with the selection affordance (e.g.,  1714 C) of the first user interface (e.g.,  1714 ) of the third set of user interfaces (e.g.,  1714 ). In response to receiving the user input associated with the selection affordance (e.g.,  1714 C) of the first user interface (e.g.,  1714 ) of the third set of user interfaces (e.g.,  1714 ), the device ceases display of the third set of affordances (e.g.,  1714 ) and displays a second audio playback user interface (e.g.,  1718 ). For example, the first user interface of the third set of user interfaces is a songs list, as illustrated by user interface  1714 , and contains a song selection affordance corresponding to the song “Approve My Eye” by the artist Atom Band, represented by selection affordance  1714 C. In this example, the device receives a user input touch on the song “Approve My Eye” represented by selection affordance  1714 C of user interface  1714 . As a result, the “now playing” screen, illustrated by user interface  1718  of  FIG. 17C , is displayed and reflects the song associated with song selection affordance  1714 C, “Approve My Eye” by Atom Band. 
     In accordance with some embodiments, while displaying a user interface (e.g.,  1714 ) of the third set of user interfaces (e.g.,  1714 ), the device receives user input representing a third contact on the touch-sensitive surface. The device determines whether a characteristic intensity of the third contact exceeds the intensity threshold. For example, while displaying a songs list as illustrated by user interface  1714  a user contacts the touch-sensitive surface. 
     In accordance with a determination that the characteristic intensity of the third contact exceeds the intensity threshold (e.g., a deep press), the device ceases display of the third set of user interfaces (e.g.,  1714 ) and displays a third set of affordances (e.g., affordances  1720 A- 1720 B of user interface  1720  in  FIG. 17C ). The device receives user input associated with a first affordance (e.g.,  1720 A) of the third set of affordances. In response to receiving the user input associated with the first affordance (e.g.,  1720 A) of the third set of affordances (e.g.,  1720 A- 1720 B), the device ceases display of the third set of affordances (e.g.,  1720 A- 1720 B) and displays a most-recently-displayed user interface (e.g.,  1704  or  1706 ) of the first set of user interfaces (e.g.,  1704 ,  1706 ). For example, the device receives a touch on affordance  1720 A, which reads “playlists”, and in response the most-recently-displayed user interface of the first set of user interfaces is displayed; the most-recently-displayed user interface of the first set (e.g.,  1704  and  1706 ) may be either user interface  1704 , illustrating a list of playlists, or user interface  1706 , illustrating a list of songs in a playlist. 
     In accordance with a determination that the characteristic intensity of the third contact does not exceed the intensity threshold (e.g., not a deep press), the device forgoes displaying the third set of affordances. Generally, however, the function associated with the location of contact may be activated (e.g., “shuffle all”). For example, if the device receives a contact on user interface  1714  at a location corresponding to affordance  1714 C, which corresponds to the song “Approve My Eye” by artist Atom Band, the device may display an updated audio playback user interface and begin song playback. 
     In accordance with some embodiments, the device receives user input representing a second movement of the rotatable input mechanism (e.g., a rotation in a direction opposite of the first movement). In response to receiving the user input representing the second movement of the rotatable input mechanism, the device displays the first audio playback user interface (e.g.,  1702 ). For example, in response to the second movement, user interface  1702  illustrating a “now playing” screen is displayed. The first movement may be in first direction and the second movement may be in a second direction, which may be different from the first. 
     In accordance with some embodiments, the first set of user interfaces, the second set of user interfaces, and the third set of user interfaces are each independently selected from the group consisting of: a playlist set of user interfaces (e.g.,  1704 ,  1706 ), an artist set of user interfaces (e.g.,  1708 ,  1710 ,  1712 ), and a songs set of user interfaces (e.g.,  1714 ); the playlist set of user interfaces (e.g.,  1704 ,  1706 ) comprises: a playlist user interface (e.g.,  1704 ) and a list of songs (e.g., illustrated by user interface  1706 ) associated with a playlist of the playlist user interface (e.g.,  1704 ).; the artist set of user interfaces comprises: an artist user interface (e.g.,  1708 ), a list of albums (e.g., illustrated by user interface  1710 ) associated with an artist of the artist user interface, and a list of songs (e.g., illustrated by user interface  1712 ) associated with an album of the list of albums (e.g., of user interface  1710 ); the songs set of user interfaces comprises a song user interface (e.g., illustrated by user interface  1714 ). 
       FIG. 18  is a flow diagram illustrating an exemplary process for accessing and playing music in accordance with some embodiments. In some embodiments, method  1800  may be performed at an electronic device with a display (e.g.,  112 ,  340 ,  504 ), a rotatable input mechanism (e.g.,  506 ), and a touch-sensitive surface (e.g.,  112 ,  355 ,  504 ). Some operations in method  1800  may be combined, the order of some operations may be changed, and some operations may be omitted. 
     In some embodiments, the touch-sensitive surface (e.g.,  112 ,  355 ,  504 ) is capable of detecting intensity of touch contacts. Exemplary devices that may perform method  1800  include devices  100 ,  300 , and  500  ( FIGS. 1A, 3, and 5A ). 
     Method  1800  provides an intuitive way to access and play music. The method reduces the cognitive burden on a user when using a device to access and play music, thereby creating a more efficient human-machine interface. For battery-operated computing devices, enabling a user to access and play music more quickly and more efficiently conserves power and increases the time between battery charges. 
     At block  1802 , a first audio playback user interface (e.g., user interface  1702 ) is displayed. 
     At block  1804 , user input representing a first movement of the rotatable input mechanism is received (e.g., the user rotates the rotatable input mechanism). 
     At block  1806 , in response to receiving the user input representing the first movement of the rotatable input mechanism, the display of the first audio playback user interface (e.g.,  1702 ) is ceased and a first user interface (e.g., user interface  1704 ) of a first set of user interfaces (e.g.,  1704 ,  1706 ) is displayed. 
     At block  1808 , while displaying a user interface (e.g.,  1704  or  1706 ) of the first set of user interfaces (e.g.,  1704 ,  1706 ), user input representing a first contact (e.g., touch) on the touch-sensitive surface is received. 
     At block  1810 , it is determined whether a characteristic intensity of the first contact exceeds an intensity threshold. 
     At block  1812 , in accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold (e.g., a deep press), display of the first set of user interfaces (e.g.,  1704  or  1706 ) is ceased and a first set of affordances is displayed (e.g., affordances  1716 A and  1716 B of user interface  1716 ). 
     At block  1814 , user input associated with a first affordance (e.g.,  1716 A) of the first set of affordances (e.g.,  1716 A- 1716 B as illustrated by user interface  1716 ) is received. 
     At block  1816 , in response to receiving the user input associated with the first affordance (e.g.,  1716 A) of the first set of affordances (e.g.,  1716 A- 1716 B), display of the first set of affordances (e.g.,  1716 A- 1716 B) is ceased and a first user interface (e.g., user interface  1708 ) of a second set of user interfaces (e.g.,  1708 ,  1710 ,  1712 ) is displayed. 
     At block  1818 , in accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold (e.g., not a deep press), the display of the first set of affordances (e.g.,  1716 A- 1716 B) is forgone. 
     In accordance with some embodiments, while displaying a user interface (e.g.,  1708 ,  1710 , or  1712 ) of the second set of user interfaces (e.g.,  1708 ,  1710 ,  1712 ), user input representing a second contact (e.g., touch) on the touch-sensitive surface is received. It is determined whether a characteristic intensity of the second contact exceeds a second intensity threshold. In accordance with a determination that the characteristic intensity of the second contact exceeds the second intensity threshold (e.g., a deep press), the display of the second set of user interfaces (e.g.,  1708 ,  1710 , or  1712 ) is ceased and a second set of affordances (e.g., affordances  1722 A- 1722 B of user interface  1722 ) is displayed. User input associated with a first affordance (e.g.,  1722 A or  1722 B) of the second set of affordances (e.g.,  1722 A- 1722 B) is received. In response to receiving the user input associated with the first affordance (e.g.,  1722 B) of the second set of affordances (e.g.,  1722 A- 1722 B), the display of the second set of affordances (e.g.,  1722 A- 1722 B) is ceased and a first user interface (e.g.,  1714 ) of a third set of user interfaces (e.g.,  1714 ) is displayed. In accordance with a determination that the characteristic intensity of the second contact does not exceed the second intensity threshold (e.g., not a deep press), the display of the second set of affordances is forgone. 
     In accordance with some embodiments, the first user interface (e.g.,  1714 ) of the third set of user interfaces (e.g.,  1714 ) comprises a selection affordance (e.g.,  1714 C). User input associated with the selection affordance (e.g.,  1714 C) of the first user interface (e.g.,  1714 ) of the third set of user interfaces (e.g.,  1714 ) is received. In response to receiving the user input associated with the selection affordance (e.g.,  1714 C) of the first user interface (e.g.,  1714 ) of the third set of user interfaces (e.g.,  1714 ), the display of the third set of affordances (e.g.,  1714 ) is ceased and a second audio playback user interface (e.g.,  1718 ) is displayed. 
     In accordance with some embodiments, while displaying a user interface (e.g.,  1714 ) of the third set of user interfaces (e.g.,  1714 ), user input representing a third contact on the touch-sensitive surface is received. It is determined whether a characteristic intensity of the third contact exceeds the intensity threshold. In accordance with a determination that the characteristic intensity of the third contact exceeds the intensity threshold (e.g., a deep press), the display of the third set of user interfaces (e.g.,  1714 ) is ceased and a third set of affordances (e.g., affordances  1720 A- 1720 B of user interface  1720  in  FIG. 17C ) is displayed. User input associated with a first affordance (e.g.,  1720 A) of the third set of affordances is received. In response to receiving the user input associated with the first affordance (e.g.,  1720 A) of the third set of affordances (e.g.,  1720 A- 1720 B), the display of the third set of affordances (e.g.,  1720 A- 1720 B) is ceased and a most-recently-displayed user interface (e.g.,  1704  or  1706 ) of the first set of user interfaces (e.g.,  1704 ,  1706 ) is displayed. In accordance with a determination that the characteristic intensity of the third contact does not exceed the intensity threshold (e.g., not a deep press), the display of the third set of affordances is forgone. 
     In accordance with some embodiments, user input representing a second movement of the rotatable input mechanism (e.g., a rotation in a direction opposite of the first movement) is received. In response to receiving the user input representing the second movement of the rotatable input mechanism, the first audio playback user interface (e.g.,  1702 ) is displayed. 
     In accordance with some embodiments, the first set of user interfaces, the second set of user interfaces, and the third set of user interfaces are each independently selected from the group consisting of: a playlist set of user interfaces (e.g.,  1704 ,  1706 ), an artist set of user interfaces (e.g.,  1708 ,  1710 ,  1712 ), and a songs set of user interfaces (e.g.,  1714 ). 
     In accordance with some embodiments, the playlist set of user interfaces (e.g.,  1704 ,  1706 ) comprises: a playlist user interface (e.g.,  1704 ) and a list of songs (e.g., illustrated by user interface  1706 ) associated with a playlist of the playlist user interface (e.g.,  1704 ). 
     In accordance with some embodiments, the artist set of user interfaces comprises: an artist user interface (e.g.,  1708 ), a list of albums (e.g., illustrated by user interface  1710 ) associated with an artist of the artist user interface, and a list of songs (e.g., illustrated by user interface  1712 ) associated with an album of the list of albums (e.g., of user interface  1710 ). 
     In accordance with some embodiments, the songs set of user interfaces comprises a song user interface (e.g., illustrated by user interface  1714 ). 
       FIGS. 19A-19C  illustrate exemplary user interfaces for accessing music using an electronic device, in accordance with some embodiments. In some embodiments, the electronic device is device  500 . The electronic device has a display (e.g.,  112 ,  340 ,  504 ), a rotatable input mechanism (e.g.,  506 ), and optionally may have a touch-sensitive surface (e.g.,  112 ,  355 ,  504 ). 
       FIG. 19A  illustrates a high-level view of the organization of various user interface screens. These and additional user interface screens will be described in further detail with respect to  FIG. 19B . User interface screen  1902  includes an audio playback user interface of a music application (e.g., a digital music player application). Upon receiving one or more user inputs, the device may provide access from user interface  1902  to user interface  1904 , user interface  1908 , and user interface  1914 . In some embodiments, user interface screen  1902  functions as described with respect to user interface screen  616 , user interface screen  1904  functions as described with respect to user interface screen  604 , user interface screen  1908  functions as described with respect to user interface screen  608 , and user interface screen  1914  functions as described with respect to user interface screen  614 . 
     User interface screen  1904  illustrates playlist selection affordances ( 1904 A- 1904 C) for accessing various music playlists. Activating a playlist selection affordance causes the device to display user interface screen  1906 . User interface screen  1906  illustrates song selection affordances ( 1906 A- 1906 B) of the activated playlist. Activating a song selection affordance causes the device to display user interface screen  1902 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. A song selection affordance of user interface  1906  (or other user interfaces with one or more song selection affordances) may also contain an indicator ( 1906 C), which may provide an indication of being stored locally on the electronic device (e.g., the song is available for playback from local memory). In accordance with some embodiments, an indicator ( 1906 C) provides an indication of not being stored locally on the electronic device (e.g., the song is not stored locally, but is available for playback through download or stream from an external electronic device, such as a phone or server). In accordance with some embodiments an indicator ( 1906 C) may provide an indication of not being available for playback (e.g., not stored locally on the electronic and not stored on an external electronic and available for playback through download or stream). In some embodiments, user interface screen  1906  functions as described with respect to user interface screen  606 . 
     User interface screen  1908  illustrates artist selection affordances ( 1908 A- 1908 C) for accessing music of various artists. Activating an artist selection affordance causes the device to display user interface screen  1910 . User interface screen  1910  illustrates album selection affordances ( 1910 A- 1910 B) of the activated artist. Activating an album selection affordance causes the device to display user interface screen  1912 , which includes song selection affordances ( 1912 A- 1912 B) of the selected album of the selected artist. Activating a song selection affordance causes the device to display user interface screen  1902 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. User interface  1912  may also contain indicator  1912 C, which may indicate whether an audio file is available locally for playback. In some embodiments, user interface screen  1910  functions as described with respect to user interface screen  610  and user interface screen  1912  functions as described with respect to user interface screen  612 . 
     User interface screen  1914  illustrates song selection affordances ( 1914 A- 1914 C). Activating a song selection affordance causes the device to display user interface screen  1902 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. 
     The audio playback user interface of user interface screen  1902  displays song information (e.g., the title and artist) of an activated (e.g., playing, paused) song. The audio playback user interface of user interface  1902  may contain affordances (e.g.,  1902 A- 1902 F) that, when selected, cause the device to play/pause, skip forward/backward, scrub to within a time in the song, and adjust the volume, among others. Similarly, user interface screen  1918  illustrates an audio playback user interface with affordances  1918 A- 1918 F wherein the interface has been updated, for example, to reflect a newly selected or different song. 
     In some embodiments, as shown in  FIG. 19B , the device displays a first audio application user interface (e.g.,  1902 ). In one example, the first audio application user interface is user interface  1902 , which illustrates a “now playing” screen. Alternatively, for example, the first audio application user interface may be selected from the group of user interfaces comprised of user interfaces  1904 ,  1908 , and  1914 . As one skilled in the art would appreciate, and consistent with  FIG. 19A , the example user interfaces referenced may represent the first through fifth audio application user interfaces herein discussed, and may be positioned in any order. Additionally, for example, the first through fifth audio application user interface may be selected from the group of user interfaces consisting of user interfaces  1904 ,  1908 ,  1910 ,  1914  and  1902 . 
     While displaying the first audio application user interface (e.g.,  1902 ), the device receives a first user input representing movement (e.g., rotation) of the rotatable input mechanism in a rotation direction. For example, the movement is in a first rotation direction, (e.g., clockwise), as opposed to a second direction (e.g., counter-clockwise). 
     In response to receiving the first user input, the device ceases display of the first audio application user interface (e.g.,  1902 ) and displays a second audio application user interface (e.g.,  1904 ). In one example, the device displays a playlist user interface  1904  in response to receiving rotation of the rotatable input mechanism. 
     While displaying the second audio application user interface (e.g.,  1904 ), the device receives a second user input representing movement (e.g., rotation) of the rotatable input mechanism in the rotation direction. For example, the movement is in the first rotation direction (e.g., clockwise). 
     In response to receiving the second user input, the device ceases display of the second audio application user interface (e.g.,  1904 ) and displays a third audio application user interface (e.g.,  1908 ). In one example, the device displays an artist list user interface  1908  in response to receiving user input. For example, the movement is in the first rotation direction (e.g., clockwise). 
     In accordance with some embodiments, while displaying the third audio application user interface (e.g.,  1908 ), the device receives a third user input (e.g., rotation) representing movement of the rotatable input mechanism in the rotation direction. In response to receiving the third user input, the device ceases display of the third audio application user interface (e.g.,  1908 ) and displays a fourth audio application user interface (e.g.,  1914 ). In one example, the device displays a song selection user interface  1914  in response to receiving user input. For example, the movement is in the first rotation direction (e.g., clockwise). 
     In accordance with some embodiments, while displaying the fourth audio application user interface, the device receives a fourth user input (e.g., rotation) representing movement of the rotatable input mechanism in the rotation direction. In response to receiving the fourth user input, the device ceases display of the fourth audio application user interface (e.g.,  1914 ) and displays a fifth audio application user interface (e.g.,  2106 ). In one example, the device displays an albums list user interface  2106  in response to receiving user input in the first rotation direction. 
     In accordance with some embodiments, one of the first, second, or third audio application user interfaces is an audio playback user interface (e.g.,  1902 ) comprising an affordance (e.g.,  1902 A) for initiating audio playback. 
     In accordance with some embodiments, one of the first, second, or third audio application user interfaces is an albums list user interface (e.g.,  2106 ). 
     In accordance with some embodiments, while displaying one of the first, second, or third audio application user interfaces (e.g.,  1904 ), the device receives user input (e.g., a touch) representing a first selection of an affordance (e.g.,  1904 B) of the displayed audio application user interface (e.g.,  1904 ). In response to receiving the user input representing the first selection (e.g., touch), the device ceases display of one of the first, second, or third audio application user interfaces (e.g.,  1904 ) and displays a detail user interface (e.g.,  1906 ). The detail user interface comprises content based on the affordance selected by the first selection. For example, the device receives selection of an affordance  1904 B, representing the playlist named “Relax”, and in response displays a detail user interface, illustrated by user interface  1906 , which displays the songs contained in “Relax”. The songs are represented by affordances  1906 A- 1906 B. 
     In accordance with some embodiments, while displaying one of the first, second, or third audio application user interfaces (e.g.,  1904 ), the device receives user input (e.g., a touch) representing a second selection of a playlist affordance (e.g.,  1904 B) associated with a playlist. In response to receiving the user input representing the second selection (e.g., touch), the device ceases display of one of the first, second, or third audio application user interfaces (e.g.,  1904 ) and displays a list of songs (e.g.,  1906 ), wherein the list of songs is based on the playlist (e.g.,  1904 B). For example, the device receives selection of a playlist at user interface  1904  and displays of a list of songs contained in that playlist. 
     In accordance with some embodiments, while displaying one of the first, second, or third audio application user interfaces (e.g.,  1908 ), the device receives user input (e.g., a touch) representing a third selection of an artist affordance (e.g.,  1908 A) associated with an artist. In response to receiving the user input (e.g., touch) representing the third selection, the device ceases display of one of the first, second, or third audio application user interfaces (e.g.,  1908 ) and displays a list of albums (e.g.,  1910 ), wherein the list of albums is based on the artist. For example, the device receives selection of an artist at user interface  1908  and displays of a list of albums associated with that artist. 
     In accordance with some embodiments, the first audio application user interface, the second audio application user interface, the third audio application user interface, the fourth audio application user interface, and the fifth audio application user interface are each independently selected from the group consisting of: a playlists user interface (e.g.,  1904 ), an artist user interface (e.g.,  1908 ), a song user interface (e.g.,  1914 ), an albums user interface (e.g.,  1912 ,  2106 ), and an audio playback user interface (e.g.,  1902 ). 
     In accordance with some embodiments, the playlists user interface comprises: a list of songs associated with a playlist of the playlist list user interface. The artist user interface comprises: an artist list user interface, a list of albums associated with an artist of the artist list user interface, and a list of songs associated with an album of the list of albums. 
     In accordance with some embodiments, the first, second, and third audio application user interfaces are each different. 
       FIG. 20  is a flow diagram illustrating an exemplary process for accessing and playing music in accordance with some embodiments. In some embodiments, method  2000  may be performed at an electronic device with a display (e.g.,  112 ,  340 ,  504 ) and a rotatable input mechanism (e.g.,  506 ). In some embodiments, the electronic device also includes a touch-sensitive surface (e.g.,  112 ,  355 ,  504 ). Some operations in method  2000  may be combined, the order of some operations may be changed, and some operations may be omitted. 
     In some embodiments, the touch-sensitive surface (e.g.,  112 ,  355 ,  504 ) is capable of detecting intensity of touch contacts. Exemplary devices that may perform method  2000  include devices  100 ,  300 , and  500  ( FIGS. 1A, 3, and 5A ). 
     Method  2000  provides an intuitive way to access and play music. The method reduces the cognitive burden on a user when using a device to access and play music, thereby creating a more efficient human-machine interface. For battery-operated computing devices, enabling a user to access and play music more quickly and more efficiently conserves power and increases the time between battery charges. 
     At block  2002 , a first audio application user interface (e.g.,  1902 ) is displayed. 
     At block  2004 , while displaying the first audio application user interface (e.g.,  1902 ), a first user input representing movement of the rotatable input mechanism in a rotation direction is received. 
     At block  2006 , in response to receiving the first user input, display of the first audio application user interface (e.g.,  1902 ) is ceased and a second audio application user interface (e.g.,  1904 ) is displayed. 
     At block  2008 , while displaying the second audio application user interface (e.g.,  1904 ), a second user input representing movement of the rotatable input mechanism in the rotation direction is received. 
     At block  2010 , in response to receiving the second user input, display of the second audio application user interface (e.g.,  1904 ) is ceased and a third audio application user interface (e.g.,  1908 ) is displayed. 
     In accordance with some embodiments, while displaying the third audio application user interface (e.g.,  1908 ), a third user input representing movement of the rotatable input mechanism in the rotation direction is received. In response to receiving the third user input, display of the third audio application user interface (e.g.,  1908 ) is ceased and a fourth audio application user interface (e.g.,  1914 ) is displayed. 
     In accordance with some embodiments, while displaying the fourth audio application user interface, a fourth user input representing movement of the rotatable input mechanism in the rotation direction is received. In response to receiving the fourth user input, display of the fourth audio application user interface (e.g.,  1914 ) is ceased and a fifth audio application user interface (e.g.,  2106 ) is displayed. 
     In accordance with some embodiments, one of the first, second, or third audio application user interfaces is an audio playback user interface (e.g.,  1902 ) comprising an affordance (e.g.,  1902 A) for initiating audio playback. 
     In accordance with some embodiments, one of the first, second, or third audio application user interfaces is an albums list user interface (e.g.,  2106 ). 
     In accordance with some embodiments, while displaying one of the first, second, or third audio application user interfaces (e.g.,  1904 ), user input representing a first selection of an affordance (e.g.,  1904 B) of the displayed audio application user interface (e.g.,  1904 ) is received. In response to receiving the user input representing the first selection, display of one of the first, second, or third audio application user interfaces (e.g.,  1904 ) is ceased and a detail user interface (e.g.,  1906 ) is displayed. The detail user interface comprises content based on the affordance selected by the first selection. 
     In accordance with some embodiments, while displaying one of the first, second, or third audio application user interfaces (e.g.,  1904 ), user input representing a second selection of a playlist affordance (e.g.,  1904 B) associated with a playlist is received. In response to receiving the user input representing the second selection, display of one of the first, second, or third audio application user interfaces (e.g.,  1904 ) is ceased and a list of songs (e.g.,  1906 ) is displayed, wherein the list of songs is based on the playlist (e.g.,  1904 B). 
     In accordance with some embodiments, while displaying one of the first, second, or third audio application user interfaces (e.g.,  1908 ), user input representing a third selection of an artist affordance (e.g.,  1908 A) associated with an artist is received. In response to receiving the user input representing the third selection, display of one of the first, second, or third audio application user interfaces (e.g.,  1908 ) is ceased and a list of albums (e.g.,  1910 ) is displayed, wherein the list of albums is based on the artist. 
     In accordance with some embodiments, the first audio application user interface, the second audio application user interface, the third audio application user interface, the fourth audio application user interface, and the fifth audio application user interface are each independently selected from the group consisting of: a playlists user interface (e.g.,  1904 ), an artist user interface (e.g.,  1908 ), a songs user interface (e.g.,  1914 ), an albums user interface (e.g.,  1912 ,  2106 ), and an audio playback user interface (e.g.,  1902 ). 
     In accordance with some embodiments, the playlists user interface comprises: a list of songs associated with a playlist of the playlist list user interface. The artist user interface comprises: an artist list user interface, a list of albums associated with an artist of the artist list user interface, and a list of songs associated with an album of the list of albums. 
     In accordance with some embodiments, the first, second, and third audio application user interfaces are each different. 
       FIGS. 21A-21C  illustrate exemplary user interfaces for accessing music using an electronic device, in accordance with some embodiments. In some embodiments, the electronic device is device  500 . The electronic device has a display (e.g.,  112 ,  340 ,  504 ), a touch-sensitive surface (e.g.,  112 ,  355 ,  504 ), and a rotatable input mechanism (e.g.,  506 ). 
       FIG. 21A  illustrates a high-level view of the organization of various user interface screens. These and additional user interface screens will be described in further detail with respect to  FIGS. 21B-21C . User interface screen  2102 , includes an audio playback user interface of a music application (e.g., a digital music player application). Upon receiving one or more user inputs, the device may provide access from user interface  2102  to user interface  2104 , user interface  2108 , and user interface  2114 . In some embodiments, user interface screen  2102  and  2118  function as described with respect to user interface screen  616 . 
     User interface screen  2104  illustrates playlist selection affordances ( 2104 A- 2104 C) for accessing various music playlists. Activating a playlist selection affordance causes the device to display user interface screen  2106 . User interface screen  2106  illustrates song selection affordances ( 2106 A- 2106 B) of the activated playlist. Activating a song selection affordance causes the device to display user interface screen  2102 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. A song selection affordance of user interface  2106  (or other user interfaces with one or more song selection affordances) may also contain an indicator ( 2106 C), which may provide an indication of being stored locally on the electronic device (e.g., the song is available for playback from local memory). In accordance with some embodiments, an indicator ( 2106 C) provides an indication of not being stored locally on the electronic device (e.g., the song is not stored locally, but is available for playback through download or stream from an external electronic device, such as a phone or server). In accordance with some embodiments an indicator ( 2106 C) may provide an indication of not being available for playback (e.g., not stored locally on the electronic and not stored on an external electronic and available for playback through download or stream). 
     User interface screen  2108  illustrates artist selection affordances ( 2108 A- 2108 C) for accessing music of various artists. Activating an artist selection affordance causes the device to display user interface screen  2110 . User interface screen  2110  illustrates album selection affordances ( 2110 A- 2110 B) of the activated artist. Activating an album selection affordance causes the device to display user interface screen  2112 , which includes song selection affordances ( 2112 A- 2112 B) of the selected album of the selected artist. Activating a song selection affordance causes the device to display user interface screen  2102 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. User interface  2112  may also contain indicator  2112 C, which may indicate whether an audio file is available locally for playback. 
     User interface screen  2114  illustrates song selection affordances ( 2114 A- 2114 C). Activating a song selection affordance causes the device to display user interface screen  2102 , which includes an audio playback user interface, and to begin audio playback of the song corresponding to the activated song selection affordance. 
     The audio playback user interface of user interface screen  2102  displays song information (e.g., the title and artist) of an activated (e.g., playing, paused) song. The audio playback user interface of user interface  2102  may contain affordances (e.g.,  2102 A- 2102 F) that, when selected, cause the device to play/pause, skip forward/backward, scrub to within a time in the song, and adjust the volume, among others. Similarly, user interface screen  2118  illustrates an audio playback user interface with affordances  2118 A- 2118 F wherein the interface has been updated, for example, to reflect a newly selected or different song. 
     A navigation interface  2116 A- 2116 C may replace all or a portion of another user interface. The navigation interface includes navigation affordances ( 2116 A- 2116 C). A navigation affordance may be associated with a particular set of user interfaces, such as a playlist set of user interfaces (e.g.,  2104 ,  2106 ), an artist set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ), and/or a songs set of user interfaces (e.g.,  2114 ). Upon receiving user input such as a swipe from the bottom of a touch-sensitive surface, for example, the navigation interface is displayed. Receiving user selection of a navigation affordance causes a user interface of the associated set of user interfaces to be displayed (or another interface associated with the navigation affordance), for example. 
     In some embodiments, as shown in  FIG. 21B , the device displays a first audio playback user interface (e.g.,  2102 ). While displaying the first audio playback user interface (e.g.,  2102 ), the device receives a first user input (e.g., rotation) representing movement of the rotatable input mechanism. In response to receiving the first user input (e.g., rotation), the device ceases display of the first audio playback user interface (e.g.,  2102 ) and displays a first user interface (e.g.,  2108 ) of a first set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ). For example, at a “now playing” screen, the device receives movement of the rotatable input mechanism, and in response displays a list of artists as illustrated by user interface  2108 . 
     While displaying a user interface (e.g., any of  2108 ,  2110 , or  2112 ) of the first set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ), the device receives a second user input representing a swipe in a first direction. In response to receiving the second user input (e.g., a swipe), the device replaces display of a portion of the user interface (e.g.,  2108 ) of the first set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ) with display of a navigation interface (e.g.,  2116 A- 2116 C). For example, upon receiving a swipe from bottom of the touch-sensitive surface, navigation interface (e.g., a menu ribbon) appears at the bottom of the screen. The second user input (e.g., swipe) may originate in any particular region of the touch-sensitive surface, for example at or near the bottom edge of the touch-sensitive surface. The navigation interface may occupy less than the entire display. 
     The navigation interface (e.g.,  2116 A- 2116 C) comprises a first navigation affordance (e.g.,  2116 B) associated with the first set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ) and a second navigation affordance (e.g.,  2116 C) associated with a second set of user interfaces (e.g.,  2114 ). In one example, the navigation interface (e.g.,  2116 A- 2116 C) comprises three affordances  2116 A- 2116 C. The navigation affordance  2116 B associated with the set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ) of the partially-displayed user interface  2108  may be highlighted (or the like) to aid user navigation. In some examples, a compact navigation affordance is displayed at the bottom of the display of a user interface (e.g.,  2114 ) of a set of user interfaces (e.g.,  2114 ). 
     The device receives a third user input associated with the second navigation affordance (e.g.,  2116 C) of the navigation interface (e.g.,  2116 A- 2116 C). In response to receiving the third user input, the device ceases display of the first set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ) and the navigation interface (e.g.,  2116 A- 2116 C) and displays a first user interface (e.g.,  2114 ) of the second set of user interfaces (e.g.,  2114 ). For example, the device receives a touch on affordance  2116 C, which is associated with the songs set of user interfaces  2114 , and displays a list of songs, illustrated by user interface  2114 . In some examples, navigation affordances  2116 A- 2116 C are still visible, in a compact state, upon the display of the second set of user interfaces. 
     In accordance with some embodiments, while displaying a user interface (e.g.,  2114 ) of the second set of user interfaces (e.g.,  2114 ), the device receives a fourth input representing a swipe in the first direction. In response to receiving the fourth user input (e.g., a swipe), the device displays the navigation interface (e.g.,  2116 A- 2116 C), wherein the navigation interface further comprises a third navigation affordance (e.g.,  2116 A) associated with a third set of user interfaces (e.g.,  2104 ,  2106 ). The device receives a fifth user input (e.g., a touch) associated with the third navigation affordance (e.g.,  2116 A) of the navigation interface (e.g.,  2116 A- 2116 C). In response to receiving the fifth user input (e.g., touch), the device ceases display of the second set of user interfaces (e.g.,  2114 ) and the navigation interface (e.g.,  2116 A- 2116 C), and displays a first user interface (e.g.,  2104 ) of the third set of user interfaces (e.g.,  2104 ,  2106 ). For example, the device receives a touch on affordance  2116 A, which is associated with the playlist set of user interfaces  2104  and  2106 , and displays a list of playlists, illustrated by user interface  2114 . 
     In accordance with some embodiments, the device receives a sixth user input (e.g., rotation) representing movement of the rotatable input mechanism. In response to receiving the sixth user input, the device displays the first audio playback user interface (e.g.,  2102 ). 
     In accordance with some embodiments, while displaying a user interface (e.g.,  2104 ,  2106 ,  2108 ,  2110 ,  2112 , or  2114 ) of any of the first set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ), the second set of user interfaces (e.g.,  2114 ), or the third set of user interfaces (e.g.,  2104 ,  2106 ), the device receives a seventh user input (e.g., a touch) associated with a selection affordance (e.g.,  2114 C) of the user interface (e.g.,  2114 ) of any of the first set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ), the second set of user interfaces (e.g.,  2114 ), or the third set of user interfaces (e.g.,  2104 ,  2106 ). In response to receiving the seventh user input (e.g., touch), the device displays a second audio playback user interface (e.g.,  2118 ). For example, the device receives a touch associated with affordance  2114 C, representing the song “Approve My Eye” by Atom Band, and in response the device displays a “now playing” screen updated to reflect the selected song. The seventh user input may be associated with a selection affordance representing a song. 
     In accordance with some embodiments, the first set of user interfaces, the second set of user interfaces, and the third set of user interfaces are each independently selected from the group consisting of: a playlist set of user interfaces (e.g.,  2104 ,  2106 ), an artist set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ), and a songs set of user interfaces (e.g.,  2114 ). The playlist set of user interfaces comprises: a playlist user interface (e.g.,  2104 ), and a list of songs (e.g.,  2106 ) associated with a playlist of the playlist user interface. The artist set of user interfaces comprises: an artist user interface (e.g.,  2108 ), a list of albums (e.g.,  2110 ) associated with an artist of the artist user interface, and a list of songs (e.g.,  2112 ) associated with an album of the list of albums (e.g.,  2110 ). The songs set of user interfaces comprises: a song user interface (e.g.,  2114 ). 
       FIG. 22  is a flow diagram illustrating an exemplary process for accessing and playing music in accordance with some embodiments. In some embodiments, method  2200  may be performed at an electronic device with a display (e.g.,  112 ,  340 ,  504 ) a rotatable input mechanism (e.g.,  506 ), and a touch-sensitive surface (e.g.,  112 ,  355 ,  504 ). Some operations in method  2200  may be combined, the order of some operations may be changed, and some operations may be omitted. 
     In some embodiments, the touch-sensitive surface (e.g.,  112 ,  355 ,  504 ) is capable of detecting intensity of touch contacts. Exemplary devices that may perform method  2200  include devices  100 ,  300 , and  500  ( FIGS. 1A, 3, and 5A ). 
     Method  2200  provides an intuitive way to access and play music. The method reduces the cognitive burden on a user when using a device to access and play music, thereby creating a more efficient human-machine interface. For battery-operated computing devices, enabling a user to access and play music more quickly and more efficiently conserves power and increases the time between battery charges. 
     At block  2202 , a first audio playback user interface (e.g.,  2102 ) is displayed. 
     At block  2204 , while displaying the first audio playback user interface (e.g.,  2102 ), a first user input representing movement of the rotatable input mechanism is received. 
     At block  2206 , in response to receiving the first user input, display of the first audio playback user interface (e.g.,  2102 ) is ceased and a first user interface (e.g.,  2104 ) of a first set of user interfaces (e.g.,  2104 ,  2106 ) is displayed. 
     At block  2208 , while displaying a user interface (e.g.,  2108 ) of the first set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ), a second user input representing a swipe in a first direction is received. 
     At block  2210 , in response to receiving the second user input, display of a portion of the user interface (e.g.,  2108 ) of the first set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ) is replaced with display of a navigation interface (e.g.,  2116 A- 2116 C). The navigation interface (e.g.,  2116 A- 2116 C) comprises a first navigation affordance (e.g.,  2116 B) associated with the first set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ) and a second navigation affordance (e.g.,  2116 C) associated with a second set of user interfaces (e.g.,  2114 ). 
     At block  2212 , a third user input associated with the second navigation affordance (e.g.,  2116 C) of the navigation interface (e.g.,  2116 A- 2116 C) is received. 
     At block  2214 , in response to receiving the third user input, display of the first set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ) and the navigation interface (e.g.,  2116 A- 2116 C) is ceased and a first user interface (e.g.,  2114 ) of the second set of user interfaces (e.g.,  2114 ) is displayed. 
     In accordance with some embodiments, while displaying a user interface (e.g.,  2114 ) of the second set of user interfaces (e.g.,  2114 ), a fourth input representing a swipe in the first direction is received. In response to receiving the fourth user input, the navigation interface (e.g.,  2116 A- 2116 C) is displayed, wherein the navigation interface further comprises a third navigation affordance (e.g.,  2116 A) associated with a third set of user interfaces (e.g.,  2104 ,  2106 ). A fifth user input associated with the third navigation affordance (e.g.,  2116 A) of the navigation interface (e.g.,  2116 A- 2116 C) is received. In response to receiving the fifth user input, display of the second set of user interfaces (e.g.,  2114 ) and the navigation interface (e.g.,  2116 A- 2116 C) is ceased and a first user interface (e.g.,  2104 ) of the third set of user interfaces (e.g.,  2104 ,  2106 ) is displayed. 
     In accordance with some embodiments, a sixth user input representing movement of the rotatable input mechanism is received. In response to receiving the sixth user input, the first audio playback user interface (e.g.,  2102 ) is displayed. 
     In accordance with some embodiments, while displaying a user interface (e.g.,  2104 ,  2106 ,  2108 ,  2110 ,  2112 , or  2114 ) of any of the first set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ), the second set of user interfaces (e.g.,  2114 ), or the third set of user interfaces (e.g.,  2104 ,  2106 ), a seventh user input is received associated with a selection affordance (e.g.,  2114 C) of the user interface (e.g.,  2114 ) of any of the first set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ), the second set of user interfaces (e.g.,  2114 ), or the third set of user interfaces (e.g.,  2104 ,  2106 ). In response to receiving the seventh user input, a second audio playback user interface (e.g.,  2118 ) is displayed. 
     In accordance with some embodiments, the first set of user interfaces, the second set of user interfaces, and the third set of user interfaces are each independently selected from the group consisting of: a playlist set of user interfaces (e.g.,  2104 ,  2106 ), an artist set of user interfaces (e.g.,  2108 ,  2110 ,  2112 ), and a songs set of user interfaces (e.g.,  2114 ). The playlist set of user interfaces comprises: a playlist user interface (e.g.,  2104 ), and a list of songs (e.g.,  2106 ) associated with a playlist of the playlist user interface. The artist set of user interfaces comprises: an artist user interface (e.g.,  2108 ), a list of albums (e.g.,  2110 ) associated with an artist of the artist user interface, and a list of songs (e.g.,  2112 ) associated with an album of the list of albums (e.g.,  2110 ). The songs set of user interfaces comprises: a song user interface. 
       FIG. 23  illustrates two user interfaces,  2302  and  2304 , each illustrating a list of songs. Affordance  2302 A, associated with a song, is displayed without an indicator in user interface  2302 . In user interface  2304 , affordance  2302 A is displayed along with an associated indicator  2304 A. Indicator  2304 A may provide an indication of being stored locally on the electronic device (e.g., the song is available for playback from local memory). In accordance with some embodiments, an indicator ( 2304 A) provides an indication of not being stored locally on the electronic device (e.g., the song is not stored locally, but is available for playback through download or stream from an external electronic device, such as a phone or server). In accordance with some embodiments an indicator ( 2304 A) may provide an indication of not being available for playback (e.g., not stored locally on the electronic and not stored on an external electronic and available for playback through download or stream). 
       FIG. 24  illustrates user interfaces for accessing a contextual menu in accordance with some embodiments. In accordance with some embodiments, a first user interface  2402  is displayed. While displaying the first user interface  2402 , the device receives a user input (e.g., a touch user input on a touch-sensitive surface or a touch-sensitive display). The device determines whether a characteristic intensity of the user input exceeds an intensity threshold. In accordance with a determination that the user input exceeds the intensity threshold, the device displays a second user interface  2404 . The second user interface includes a contextual menu (e.g., one or more affordances, which, when activated, perform a function). In some examples, the location of the user input on the touch-sensitive display is irrelevant when the characteristic intensity of the user input exceeds the intensity threshold. Thus, it doesn&#39;t matter where on the touch-sensitive surface the user provides a touch input exceeding the intensity threshold. In accordance with a determination that the user input does not exceed the intensity threshold, the device forgoes displaying the second user interface  2404 . Instead, when the characteristic intensity of the user input does not exceed the intensity threshold, the device may perform an action based on the location of the user input. 
     In accordance with some embodiments,  FIG. 25  shows a functional block diagram of an electronic device  2500  configured in accordance with the principles of the various described embodiments. The functional blocks of the device are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described embodiments. It is understood by persons of skill in the art that the functional blocks described in  FIG. 25  are, optionally, combined or separated into sub-blocks to implement the principles of the various described embodiments. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     As shown in  FIG. 25 , an electronic device  2500  includes a display unit  2502  configured to display a graphic user interface, a rotatable input mechanism unit  2504  configured to receive movements, an optional touch-sensitive surface unit  2506  configured to receive touches and detect intensity of touches, and a processing unit  2508  coupled to the display unit  2502 , the rotatable input mechanism unit  2504 , and the optional touch-sensitive surface unit  2506 . In some embodiments, the processing unit  2508  includes a display enabling unit  2510 , a receiving unit  2512 , a determining unit  2514 , a playback starting unit  2516 , and a display replacing unit  2518 . 
     The processing unit  2508  is configured to: enable display (e.g., with display enabling unit  2510 ) of, on the display, an affordance representing a music application; receive (e.g., with receiving unit  2512 ) user input representing movement of the rotatable input mechanism; in response to receiving the user input representing the movement of the rotatable input mechanism, enable display (e.g., with display enabling unit  2510 ) of a landing screen of the music application, wherein the landing screen includes display of a playlist affordance, an artist list affordance, and a song list affordance. The processing unit  2508  is further configured to receive (e.g., with receiving unit  2512 ) user input associated with the landing screen; determine (e.g., with determining unit  2514 ) whether the user input associated with the landing screen represents a touch associated with the playlist affordance, the artist affordance, or the song affordance; in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the playlist affordance, enable display (e.g., with display enabling unit  2510 ) of, on the display, one or more playlist selection affordances; in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the artist list affordance, enable display (e.g., with display enabling unit  2510 ) of, on the display, one or more artist selection affordances; and in response to receiving the user input associated with the landing screen and in accordance with a determination that the user input associated with the landing screen represents a touch associated with the song list affordance, enable display (e.g., with display enabling unit  2510 ) of, on the display, one or more song selection affordances. 
     In some embodiments, the electronic device includes a touch-sensitive surface configured to receive touches and detect intensity of touches, and the processing unit  2508  is further configured to: while displaying the one or more playlist selection affordances, receive (e.g., with receiving unit  2512 ) user input representing a touch on a playlist selection affordance of the one or more playlist selection affordances; determine (e.g., with determining unit  2514 ) whether a characteristic intensity of the touch on the playlist selection affordance exceeds an intensity threshold; and in accordance with a determination that the characteristic intensity of the touch on the playlist selection affordance exceeds the intensity threshold, enable display (e.g., with display enabling unit  2510 ) of, on the display, a first set of affordances. 
     In some embodiments, the first set of affordances includes a source affordance. 
     In some embodiments, the processing unit  2508  is further configured to: in response to receiving the user input representing the touch on the playlist selection affordance and in accordance with a determination that the characteristic intensity of the touch on the playlist selection affordance does not exceed the intensity threshold, enable display (e.g., with display enabling unit  2510 ) of, on the display, one or more song selection affordances of a playlist associated with the playlist selection affordance. 
     In some embodiments, the processing unit  2508  is further configured to: while displaying the one or more song selection affordances of the playlist, receive (e.g., with receiving unit  2512 ) user input representing a touch on a song selection affordance of the one or more song selection affordances of the playlist; determine (e.g., with determining unit  2514 ) whether a characteristic intensity of the touch on the song selection affordance exceeds an intensity threshold; and in accordance with a determination that the characteristic intensity of the touch on the song selection affordance exceeds the intensity threshold, enable display (e.g., with display enabling unit  2510 ) of, on the display, a second set of affordances. 
     In some embodiments, the second set of affordances includes one or more of a shuffle affordance and a source affordance. 
     In some embodiments, the processing unit  2508  is further configured to: in response to receiving the user input representing the touch on the song selection affordance and in accordance with a determination that the characteristic intensity of the touch on the song selection affordance does not exceed the intensity threshold: enable display (e.g., with display enabling unit  2510 ) of, on the display, an audio playback user interface, and start audio playback (e.g., with playback starting unit  2516 ) of an audio file associated with the song selection affordance. 
     In some embodiments, the electronic device includes a touch-sensitive surface unit configured to receive touches and detect intensity of touches and coupled to the processing unit  2508 , and the processing unit  2508  is further configured to: while displaying the one or more artist selection affordances, receive (e.g., with receiving unit  2512 ) user input representing a touch on an artist selection affordance of the one or more artist selection affordances; determine (e.g., with determining unit  2514 ) whether a characteristic intensity of the touch on the artist selection affordance exceeds an intensity threshold; and in accordance with a determination that the characteristic intensity of the touch on the artist selection affordance exceeds the intensity threshold, enable display (e.g., with display enabling unit  2510 ) of, on the display, a third set of affordances. 
     In some embodiments, the third set of affordances includes a source affordance. 
     In some embodiments, the processing unit  2508  is further configured to: in response to receiving the user input representing the touch on the artist selection affordance and in accordance with a determination that the characteristic intensity of the touch on the artist selection affordance does not exceed the intensity threshold, enable display (e.g., with display enabling unit  2510 ) of, on the display, one or more album selection affordances of an artist associated with the artist selection affordance. 
     In some embodiments, the processing unit  2508  is further configured to: while displaying the one or more album selection affordances of the artist, receive (e.g., with receiving unit  2512 ) user input representing a touch on an album selection affordance of the one or more album selection affordances of the artist; determine (e.g., with determining unit  2514 ) whether a characteristic intensity of the touch on the album selection affordance exceeds an intensity threshold; and in accordance with a determination that the characteristic intensity of the touch on the album selection affordance exceeds the intensity threshold, enable display (e.g., with display enabling unit  2510 ) of, on the display, a fourth set of affordances. 
     In some embodiments, the fourth set of affordances includes a source affordance. 
     In some embodiments, the processing unit  2508  is further configured to: in response to receiving the user input representing the touch on the album selection affordance and in accordance with a determination that the characteristic intensity of the touch on the album selection affordance does not exceed the intensity threshold, enable display (e.g., with display enabling unit  2510 ) of, on the display, one or more song selection affordances of an album associated with the album selection affordance. 
     In some embodiments, the processing unit  2508  is further configured to: while displaying the one or more song selection affordances of the album associated with the album selection affordance, receive (e.g., with receiving unit  2512 ) user input representing a touch on a song selection affordance of the one or more song selection affordances of the album associated with the album selection affordance; determine (e.g., with determining unit  2514 ) whether a characteristic intensity of the touch on the song selection affordance exceeds an intensity threshold; and in accordance with a determination that the characteristic intensity of the touch on the song selection affordance exceeds the intensity threshold, enable display (e.g., with display enabling unit  2510 ) of, on the display, a fifth set of affordances. 
     In some embodiments, the fifth set of affordances includes one or more of a shuffle affordance and a source affordance. 
     In some embodiments, the processing unit  2508  is further configured to: in response to receiving the user input representing the touch on the song selection affordance and in accordance with a determination that the characteristic intensity of the touch on the song selection affordance does not exceed the intensity threshold: enable display (e.g., with display enabling unit  2510 ) of, on the display, an audio playback user interface, and start audio playback (e.g., with playback starting unit  2516 ) of an audio file associated with the song selection affordance. 
     In some embodiments, the electronic device includes a touch-sensitive surface unit configured to receive touches and detect intensity of touches and coupled to the processing unit  2508 , and the processing unit  2508  is further configured to: while displaying the one or more song selection affordances, receive (e.g., with receiving unit  2512 ) user input representing a touch on a song selection affordance of the one or more song selection affordances; determine (e.g., with determining unit  2514 ) whether a characteristic intensity of the touch on the song selection affordance exceeds an intensity threshold; and in accordance with a determination that the characteristic intensity of the touch on the song selection affordance exceeds the intensity threshold, enable display (e.g., with display enabling unit  2510 ) of, on the display, a sixth set of affordances. 
     In some embodiments, the sixth set of affordances includes one or more of a shuffle affordance and a source affordance. 
     In some embodiments, the processing unit  2508  is further configured to: in response to receiving the user input representing the touch on the song selection affordance and in accordance with a determination that the characteristic intensity of the touch on the song selection affordance does not exceed the intensity threshold: enable display (e.g., with display enabling unit  2510 ) of, on the display, an audio playback user interface, and start audio playback (e.g., with playback starting unit  2516 ) of an audio file associated with the song selection affordance. 
     In some embodiments, the processing unit  2508  is further configured to: while displaying the audio playback user interface, receive (e.g., with receiving unit  2512 ) user input representing a touch on the audio playback user interface; determine (e.g., with determining unit  2514 ) whether a characteristic intensity of the touch on the audio playback user interface exceeds an intensity threshold; and in accordance with a determination that the characteristic intensity of the touch on the audio playback user interface exceeds the intensity threshold, enable display (e.g., with display enabling unit  2510 ) of, on the display, a seventh set of affordances. 
     In some embodiments, the seventh set of affordances includes one or more of a shuffle affordance, a repeat affordance, and a source affordance. 
     In some embodiments, the processing unit  2508  is further configured to: receive (e.g., with receiving unit  2512 ) user input; in response to receiving the user input, enable display (e.g., with display enabling unit  2510 ) of, on the display the affordance representing the music application; determine (e.g., with determining unit  2514 ) whether the music application is currently playing an audio file; and in accordance with a determination that the music application is currently playing an audio file, enable display (e.g., with display enabling unit  2510 ) of an affordance representing the audio playback user interface; receive (e.g., with receiving unit  2512 ) user input representing a touch on the affordance representing the audio playback user interface; and in response to receiving the user input representing the touch on the affordance representing the audio playback user interface, enable display (e.g., with display enabling unit  2510 ) of, on the display, the audio playback user interface. 
     In some embodiments, the processing unit  2508  is further configured to: receive (e.g., with receiving unit  2512 ) user input; in response to receiving the user input, enable display (e.g., with display enabling unit  2510 ) of, a user interface for an application, wherein the application and the music application are different applications; determine (e.g., with determining unit  2514 ) whether the music application is currently playing an audio file; in accordance with a determination that the music application is currently playing an audio file, enable display (e.g., with display enabling unit  2510 ) of an affordance representing the audio playback user interface; and wherein the affordance representing the audio playback user interface and the user interface for the application are displayed concurrently. 
     In some embodiments, the processing unit  2508  is further configured to: receive (e.g., with receiving unit  2512 ) user input representing a touch on the affordance representing the audio playback user interface; and in response to receiving the user input representing the touch on the affordance representing the audio playback user interface, replace display (e.g., with display replacing unit  2518 ) of the user interface for the application with display of a user interface for the music application. 
     In some embodiments, the user interface for the music application comprises the audio playback user interface. 
     In some embodiments, the processing unit  2508  is further configured to: determine (e.g., with determining unit  2514 ) whether the music application is currently playing an audio file; in accordance with a determination that the music application is currently playing an audio file, enable display (e.g., with display enabling unit  2510 ) of an affordance representing the audio playback user interface; receive (e.g., with receiving unit  2512 ) user input representing a touch on the affordance representing the audio playback user interface; and in response to receiving the user input representing the touch on the affordance representing the audio playback user interface, enable display (e.g., with display enabling unit  2510 ) of, on the display, the audio playback user interface. 
     In some embodiments, the processing unit  2508  is further configured to: determine (e.g., with determining unit  2514 ) whether a phone call is currently active, the currently active phone call associated with a phone application; in accordance with a determination that a phone call is currently active, enable display (e.g., with display enabling unit  2510 ) of an affordance representing the phone application, wherein the affordance representing the phone application and the affordance representing the audio playback user interface are displayed concurrently; receive (e.g., with receiving unit  2512 ) user input representing a touch on the affordance representing the phone application; and in response to receiving the user input representing the touch on the affordance representing the phone application, enable display (e.g., with display enabling unit  2510 ) of, on the display, a user interface of the phone application. 
     In some embodiments, the song selection affordance of the one or more song selection affordances includes an indication of being stored locally on the electronic device. 
     In some embodiments, the song selection affordance of the one or more song selection affordances includes an indication of not being stored locally on the electronic device. 
     In some embodiments, the song selection affordance of the one or more song selection affordances includes an indication of being stored on an external electronic device. 
     The operations described above with reference to  FIG. 7  are, optionally, implemented by components depicted in  FIGS. 1A-1B  or  FIG. 25 . For example, display operation at block  702 , receive operation at block  704 , display operation at block  706 , receive operation at block  708 , determine operation at block  710 , display operation at block  712 , display operation at block  714 , and display operation at block  716  may be implemented by event sorter  170 , event recognizer  180 , and event handler  190 . Event monitor  171  in event sorter  170  detects a contact on touch-sensitive display  112 , and event dispatcher module  174  delivers the event information to application  136 - 1 . A respective event recognizer  180  of application  136 - 1  compares the event information to respective event definitions  186 , and determines whether a first contact at a first location on the touch-sensitive surface corresponds to a predefined event or sub event, such as activation of an affordance on a user interface. When a respective predefined event or sub-event is detected, event recognizer  180  activates an event handler  190  associated with the detection of the event or sub-event. Event handler  190  may utilize or call data updater  176  or object updater  177  to update the application internal state  192 . In some embodiments, event handler  190  accesses a respective GUI updater  178  to update what is displayed by the application. Similarly, it would be clear to a person having ordinary skill in the art how other processes can be implemented based on the components depicted in  FIGS. 1A-1B . 
     In accordance with some embodiments,  FIG. 26  shows a functional block diagram of an electronic device  2600  configured in accordance with the principles of the various described embodiments. The functional blocks of the device are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described embodiments. It is understood by persons of skill in the art that the functional blocks described in  FIG. 26  are, optionally, combined or separated into sub-blocks to implement the principles of the various described embodiments. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     As shown in  FIG. 26 , an electronic device  2600  includes a display unit  2602  configured to display a graphic user interface, a rotatable input mechanism unit  2604  configured to receive movements, a touch-sensitive surface unit  2606  configured to receive contacts, and a processing unit  2608  coupled to the display unit  2602 , the rotatable input mechanism unit  2604 , and the touch-sensitive surface unit  2606 . In some embodiments, the processing unit  2608  includes a display enabling unit  2610 , a receiving unit  2612 , a display ceasing unit  2614 , a determining unit  2616 , and a transitioning unit  2618 . 
     The processing unit  2608  is configured to: enable display (e.g., with display enabling unit  2610 ) of an audio playback user interface; receive (e.g., with receiving unit  2612 ) a first user input representing movement of the rotatable input mechanism in a rotation direction; in response to receiving the first user input representing the movement of the rotatable input mechanism in the rotation direction, cease display (e.g., with display ceasing unit  2614 ) of the audio playback user interface and enable display (e.g., with display enabling unit  2610 ) of a navigation screen of a music application, wherein the navigation screen includes a playlist affordance, an artist list affordance, and a song list affordance; receive (e.g., with receiving unit  2612 ) a second user input associated with the navigation screen; determine (e.g., with determining unit  2616 ) whether the second user input represents a contact on the touch-sensitive surface associated with the playlist affordance, the artist list affordance, or the song list affordance; in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the playlist affordance, cease display (e.g., with display ceasing unit  2614 ) of the navigation screen and enable display (e.g., with display enabling unit  2610 ) of a first playlist user interface of two or more playlist user interfaces; in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the artist list affordance, cease display (e.g., with display ceasing unit  2614 ) of the navigation screen and enable display (e.g., with display enabling unit  2610 ) of an artist user interface of two or more artist user interfaces; and in response to receiving the second user input and in accordance with a determination that the second user input represents a contact associated with the song list affordance, cease display (e.g., with display ceasing unit  2614 ) of the navigation screen and enable display (e.g., with display enabling unit  2610 ) of a song user interface of one or more song user interfaces. 
     In some embodiments, the processing unit  2608  is further configured to: while displaying one of the two or more playlist user interfaces, receive (e.g., with receiving unit  2612 ) one or more playlist navigation inputs; in response to receiving the one or more playlist navigation inputs, transition (e.g., with transitioning unit  2618 ) one or more times among each of the two or more playlist user interfaces to display a last-displayed playlist user interface of the two or more playlist user interfaces; while displaying the last-displayed playlist user interface, receive (e.g., with receiving unit  2612 ) a first directional swipe; in response to receiving the first directional swipe and in accordance with a determination that the first directional swipe represents a swipe in a first direction, cease display (e.g., with display ceasing unit  2614 ) of the last-displayed playlist user interface and enable display (e.g., with display enabling unit  2610 ) of the artist user interface of the two or more artist user interfaces; while displaying the artist user interface of the two or more artist user interfaces, receive (e.g., with receiving unit  2612 ) a second directional swipe; in response to receiving the second directional swipe, cease display (e.g., with display ceasing unit  2614 ) of the artist user interface of the two or more artist user interfaces and enable display (e.g., with display enabling unit  2610 ) of the last-displayed playlist user interface of the two or more playlist user interfaces. 
     The some embodiments, the processing unit  2608  is further configured to: while displaying one of the two or more playlist user interfaces, receive (e.g., with receiving unit  2612 ) one or more playlist navigation inputs; in response to receiving the one or more playlist navigation inputs, transition (e.g., with transitioning unit  2618 ) one or more times among each of the two or more playlist user interfaces to display a last-displayed playlist user interface of the two or more playlist user interfaces; while displaying the last-displayed playlist user interface, receive (e.g., with receiving unit  2612 ) a third directional swipe; in response to receiving the third directional swipe and in accordance with a determination that the third directional swipe represents a swipe in a second direction, cease display (e.g., with display ceasing unit  2614 ) of the last-displayed playlist user interface and enable display (e.g., with display enabling unit  2610 ) of the song user interface of the one or more song user interfaces; while displaying the song user interface of the one or more song user interfaces, receive (e.g., with receiving unit  2612 ) a fourth directional swipe; and in response to receiving the fourth directional swipe, cease display (e.g., with display ceasing unit  2614 ) of the song user interface of the one or more song user interfaces and enable display (e.g., with display enabling unit  2610 ) of the last-displayed playlist user interface of the two or more playlist user interfaces. 
     In some embodiments, the processing unit  2608  is further configured to: receive (e.g., with receiving unit  2612 ) a third user input representing movement of the rotatable input mechanism in a second rotation direction; and in response to receiving the third user input, enable display (e.g., with display enabling unit  2610 ) of the audio playback user interface. 
     In some embodiments, the audio playback user interface comprises an affordance for initiating audio playback. 
     In some embodiments, one playlist user interface of the two or more playlist user interfaces comprises an affordance which, when selected, causes the audio playback user interface to be displayed; one artist user interface of the two or more artist user interfaces comprises an affordance which, when selected, causes the audio playback user interface to be displayed; and one song user interface of the one or more song user interfaces comprises an affordance which, when selected, causes the audio playback user interface to be displayed. 
     The operations described above with reference to  FIG. 10  are, optionally, implemented by components depicted in  FIGS. 1A-1B  or  FIG. 26 . For example, display operation at block  1002 , receive operation at block  1004 , cease display and display operation at block  1006 , receive operation at block  1008 , determine operation at block  1010 , cease display and display operation at block  1012 , cease display and display operation at block  1014 , and cease display and display operation at block  1016  may be implemented by event sorter  170 , event recognizer  180 , and event handler  190 . Event monitor  171  in event sorter  170  detects a contact on touch-sensitive display  112 , and event dispatcher module  174  delivers the event information to application  136 - 1 . A respective event recognizer  180  of application  136 - 1  compares the event information to respective event definitions  186 , and determines whether a first contact at a first location on the touch-sensitive surface corresponds to a predefined event or sub event, such as activation of an affordance on a user interface. When a respective predefined event or sub-event is detected, event recognizer  180  activates an event handler  190  associated with the detection of the event or sub-event. Event handler  190  may utilize or call data updater  176  or object updater  177  to update the application internal state  192 . In some embodiments, event handler  190  accesses a respective GUI updater  178  to update what is displayed by the application. Similarly, it would be clear to a person having ordinary skill in the art how other processes can be implemented based on the components depicted in  FIGS. 1A-1B . 
     In accordance with some embodiments,  FIG. 27  shows a functional block diagram of an electronic device  2700  configured in accordance with the principles of the various described embodiments. The functional blocks of the device are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described embodiments. It is understood by persons of skill in the art that the functional blocks described in  FIG. 27  are, optionally, combined or separated into sub-blocks to implement the principles of the various described embodiments. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     As shown in  FIG. 27 , an electronic device  2700  includes a display unit  2702  configured to display a graphic user interface, a rotatable input mechanism unit  2704  configured to receive movements, a touch-sensitive surface unit  2706  configured to receive contacts, and a processing unit  2708  coupled to the display unit  2702 , the rotatable input mechanism unit  2704 , and the touch-sensitive surface unit  2706 . In some embodiments, the processing unit  2708  includes a display enabling unit  2710 , a receiving unit  2712 , a determining unit  2714 , a display ceasing unit  2716 , and a song playing unit  2718 . 
     The processing unit  2708  is configured to: enable display (e.g., with display enabling unit  2710 ) of a first audio playback user interface; receive (e.g., with receiving unit  2712 ) user input representing movement of the rotatable input mechanism; in response to receiving the user input representing the movement of the rotatable input mechanism, cease display (e.g., with display ceasing unit  2716 ) of the first audio playback user interface and enable display (e.g., with display enabling unit  2710 ) of a first user interface of a first set of user interfaces; receive (e.g., with receiving unit  2712 ) a first user input representing a directional swipe on the touch-sensitive surface; determine (e.g., with determining unit  2714 ) whether the first user input represents a swipe in a first direction or a second direction; in response to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the first direction, cease display (e.g., with display ceasing unit  2716 ) of the first user interface of the first set of user interfaces and enable display (e.g., with display enabling unit  2710 ) of a first user interface of a second set of user interfaces; and in response to receiving the first user input and in accordance with a determination that the first user input represents a swipe in the second direction, cease display (e.g., with display ceasing unit  2716 ) of the first user interface of the first set of user interfaces and enable display (e.g., with display enabling unit  2710 ) of a first user interface of a third set of user interfaces. 
     In some embodiments, the processing unit  2708  is further configured to: receive (e.g., with receiving unit  2712 ) a second user input representing a directional swipe on the touch-sensitive surface; in accordance with the determination that the first user input represents a swipe in the first direction, in response to receiving the second user input and, in accordance with a determination that the second user input represents a swipe in the first direction, cease display (e.g., with display ceasing unit  2716 ) of the second set of user interfaces and enable display (e.g., with display enabling unit  2710 ) of the first user interface of the third set of user interfaces; and in accordance with the determination that the first user input represents a swipe in the second direction, in response to receiving the second user input, and in accordance with a determination that the second user input represents a swipe in the second direction, cease display (e.g., with display ceasing unit  2716 ) of the third set of user interfaces and enable display (e.g., with display enabling unit  2710 ) of the first user interface of the second set of user interfaces. 
     In some embodiments, the first user interface of the third set of user interfaces comprises a selection affordance; and the processing unit  2708  is further configured to: receive (e.g., with receiving unit  2712 ) a third user input associated with the selection affordance of the first user interface of the third set of user interfaces; and in response to receiving the third user input, cease display (e.g., with display ceasing unit  2716 ) of the first user interface of the third set of user interfaces and enable display (e.g., with display enabling unit  2710 ) of a second audio playback user interface. 
     In some embodiments, the selection affordance of the first user interface of the third set of user interfaces is a song selection affordance; and the processing unit  2708  is further configured to: in response to receiving the third user input, play a song (e.g., with song playing unit  2718 ) associated with the selection affordance. 
     In some embodiments, the selection affordance of the first user interface of the third set of user interfaces is a shuffle all affordance; and the processing unit  2708  is further configured to: in response to receiving the third user input, play a song (e.g., with song playing unit  2718 ) selected at random from a set of songs associated with the selection affordance. 
     In some embodiments, the processing unit  2708  is further configured to: prior to receiving the first user input representing a directional swipe, receive (e.g., with receiving unit  2712 ) user input associated with a selection affordance of the first user interface of the first set of user interfaces; and in response to receiving the user input associated with the selection affordance of the first user interface of the first set of user interfaces, cease display (e.g., with display ceasing unit  2716 ) of the first user interface of the first set of user interfaces and enable display (e.g., with display enabling unit  2710 ) of a second user interface of the first set of user interfaces. 
     In some embodiments, the first set of user interfaces, the second set of user interfaces, and the third set of user interfaces are each independently selected from the group consisting of: a playlist set of user interfaces, an artist set of user interfaces, and a songs set of user interfaces; the playlist set of user interfaces comprises: a playlist user interface, and a list of songs associated with a playlist of the playlist user interface; the artist set of user interfaces comprises: an artist user interface, a list of albums associated with an artist of the artist user interface, and a list of songs associated with an album of the list of albums; and the songs set of user interfaces comprises: a song user interface. 
     The operations described above with reference to  FIG. 12  are, optionally, implemented by components depicted in  FIGS. 1A-1B  or  FIG. 27 . For example, display operation at block  1202 , receive operation at block  1204 , cease display and display operation at block  1206 , receive operation at block  1208 , determine operation at block  1210 , cease display and display operation at block  1212 , and cease display and display operation at block  1214  may be implemented by event sorter  170 , event recognizer  180 , and event handler  190 . Event monitor  171  in event sorter  170  detects a contact on touch-sensitive display  112 , and event dispatcher module  174  delivers the event information to application  136 - 1 . A respective event recognizer  180  of application  136 - 1  compares the event information to respective event definitions  186 , and determines whether a first contact at a first location on the touch-sensitive surface corresponds to a predefined event or sub event, such as activation of an affordance on a user interface. When a respective predefined event or sub-event is detected, event recognizer  180  activates an event handler  190  associated with the detection of the event or sub-event. Event handler  190  may utilize or call data updater  176  or object updater  177  to update the application internal state  192 . In some embodiments, event handler  190  accesses a respective GUI updater  178  to update what is displayed by the application. Similarly, it would be clear to a person having ordinary skill in the art how other processes can be implemented based on the components depicted in  FIGS. 1A-1B . 
     In accordance with some embodiments,  FIG. 28  shows a functional block diagram of an electronic device  2800  configured in accordance with the principles of the various described embodiments. The functional blocks of the device are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described embodiments. It is understood by persons of skill in the art that the functional blocks described in  FIG. 28  are, optionally, combined or separated into sub-blocks to implement the principles of the various described embodiments. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     As shown in  FIG. 28 , an electronic device  2800  includes a display unit  2802  configured to display a graphic user interface, a rotatable input mechanism unit  2804  configured to receive movements, and a processing unit  2808  coupled to the display unit  2802  and the rotatable input mechanism unit  2804 . In some embodiments, the processing unit  2808  includes a display enabling unit  2810 , a receiving unit  2812 , and a display ceasing unit  2814 . 
     The processing unit  2808  is configured to: enable display (e.g., with display enabling unit  2810 ) of an audio playback user interface; receive (e.g., with receiving unit  2812 ) a first user input representing a directional swipe in a first direction; in response to receiving the first user input, cease display (e.g., with display ceasing unit  2814 ) of the audio playback user interface and enable display (e.g., with display enabling unit  2810 ) of a first user interface of a first set of user interfaces, the first user interface of the first set of user interfaces comprising a selection affordance. The processing unit  2808  is further configured to, while displaying a user interface of the first set of user interfaces, receive (e.g., with receiving unit  2812 ) a second user input representing a directional swipe in a second direction; and in response to receiving the second user input, cease display (e.g., with display ceasing unit  2814 ) of the first user interface of a first set of user interfaces and enable display (e.g., with display enabling unit  2810 ) of the audio playback user interface. 
     In some embodiments, the processing unit  2808  is further configured to: while displaying the first user interface of the first set of user interfaces (e.g., list of playlists), and prior to receiving the second user input, receive (e.g., with receiving unit  2812 ) a third user input associated with the selection affordance of the first user interface of the first set of user interfaces; and in response to receiving the third user input, cease display (e.g., with display ceasing unit  2814 ) of the first user interface of a first set of user interfaces and enable display (e.g., with display enabling unit  2810 ) of a second user interface of the first set of user interfaces, the second user interface of the first set of user interfaces comprising a selection affordance. 
     In some embodiments, the processing unit  2808  is further configured to: receive (e.g., with receiving unit  2812 ) a plurality of directional user inputs, wherein the plurality of directional user inputs comprises: a plurality of user inputs representing directional swipes in the first direction, and a plurality of user inputs representing directional swipes in the second direction; and in response to receiving a final user input of the plurality of directional user inputs, enable display (e.g., with display enabling unit  2810 ) of the audio playback user interface. 
     In some embodiments, the processing unit  2808  is further configured to: in response to receiving one of the plurality of directional user inputs, enable display (e.g., with display enabling unit  2810 ) of a first user interface of a second set of user interfaces, the first user interface of the second set of user interfaces comprising a selection affordance. 
     In some embodiments, the processing unit  2808  is further configured to: receive (e.g., with receiving unit  2812 ) a fourth user input associated with the selection affordance of the first user interface of the second set of user interfaces; and in response to receiving the fourth user input, cease display (e.g., with display ceasing unit  2814 ) of the first user interface of the second set of user interfaces and enable display (e.g., with display enabling unit  2810 ) of a second user interface of the second set of user interfaces comprising a selection affordance. 
     In some embodiments, the processing unit  2808  is further configured to: receive (e.g., with receiving unit  2812 ) a fifth user input associated with the selection affordance of the second user interface of the second set of user interfaces; and in response to receiving the fifth user input, cease display (e.g., with display ceasing unit  2814 ) of the second user interface of the second set of user interfaces and enable display (e.g., with display enabling unit  2810 ) of the audio playback user interface, wherein the audio playback user interface is updated based on the selection affordance associated with the fifth user input. 
     In some embodiments, the first set of user interfaces, the second set of user interfaces, and the third set of user interfaces are selected from the group comprising: a playlist set of user interfaces, an artist set of user interfaces, and a songs set of user interfaces; wherein the playlist set of user interfaces comprises: a playlist user interface, and a list of songs associated with a playlist of the playlist user interface; the artist set of user interfaces comprises: an artist user interface, a list of albums associated with an artist of the artist user interface, and a list of songs associated with an album of the list of albums; and the songs set of user interfaces comprises: a song user interface. 
     The operations described above with reference to  FIG. 14  are, optionally, implemented by components depicted in  FIGS. 1A-1B  or  FIG. 28 . For example, display operation at block  1402 , receive operation at block  1404 , cease display and display operation at block  1406 , receive operation at block  1408 , and cease display and display operation at block  1410  may be implemented by event sorter  170 , event recognizer  180 , and event handler  190 . Event monitor  171  in event sorter  170  detects a contact on touch-sensitive display  112 , and event dispatcher module  174  delivers the event information to application  136 - 1 . A respective event recognizer  180  of application  136 - 1  compares the event information to respective event definitions  186 , and determines whether a first contact at a first location on the touch-sensitive surface corresponds to a predefined event or sub event, such as activation of an affordance on a user interface. When a respective predefined event or sub-event is detected, event recognizer  180  activates an event handler  190  associated with the detection of the event or sub-event. Event handler  190  may utilize or call data updater  176  or object updater  177  to update the application internal state  192 . In some embodiments, event handler  190  accesses a respective GUI updater  178  to update what is displayed by the application. Similarly, it would be clear to a person having ordinary skill in the art how other processes can be implemented based on the components depicted in  FIGS. 1A-1B . 
     In accordance with some embodiments,  FIG. 29  shows a functional block diagram of an electronic device  2900  configured in accordance with the principles of the various described embodiments. The functional blocks of the device are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described embodiments. It is understood by persons of skill in the art that the functional blocks described in  FIG. 29  are, optionally, combined or separated into sub-blocks to implement the principles of the various described embodiments. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     As shown in  FIG. 29 , an electronic device  2900  includes a display unit  2902  configured to display a graphic user interface, a touch-sensitive surface unit  2904  configured to receive contacts, and a processing unit  2908  coupled to the display unit  2902  and the touch-sensitive surface unit  2904 . In some embodiments, the processing unit  2908  includes a display enabling unit  2910 , a receiving unit  2912 , a determining unit  2914 , a display ceasing unit  2916 , and a display forgoing unit  2918 . 
     The processing unit  2908  is configured to: enable display (e.g., with display enabling unit  2910 ) of an audio playback user interface; while displaying the audio playback user interface, receive (e.g., with receiving unit  2912 ) user input representing a first contact on the touch-sensitive surface; determine (e.g., with determining unit  2914 ) whether a characteristic intensity of the first contact exceeds an intensity threshold; in accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold, cease display (e.g., with display ceasing unit  2916 ) of the audio playback user interface and enable display (e.g., with display enabling unit  2910 ) of a first set of affordances; receive (e.g., with receiving unit  2912 ) user input representing a second contact associated with an affordance of the first set of affordances; in response to receiving the second contact, cease display (e.g., with display ceasing unit  2916 ) of the first set of affordances and enable display (e.g., with display enabling unit  2910 ) of a first user interface of a first set of user interfaces; and in accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold, forgo display (e.g., with display forgoing unit  2918 ) of the first set of affordances. 
     In some embodiments, the determination that the characteristic intensity of the first contact exceeds the intensity threshold is independent of a location of the first contact on the touch-sensitive surface. 
     In some embodiments, the processing unit  2908  is further configured to: while displaying the first user interface of the first set of user interfaces, receive (e.g., with receiving unit  2912 ) user input representing a first swipe in a first direction; and in response to receiving the first swipe in the first direction, cease display (e.g., with display ceasing unit  2916 ) of the first user interface of a first set of user interfaces and enable display (e.g., with display enabling unit  2910 ) of a first user interface of a second set of user interfaces. 
     In some embodiments, the processing unit  2908  is further configured to: while displaying the first user interface of the second set of user interfaces, receive (e.g., with receiving unit  2912 ) user input representing a second swipe in the first direction; and in response to receiving the second swipe, cease display (e.g., with display ceasing unit  2916 ) of the first user interface of a second set of user interfaces and enable display (e.g., with display enabling unit  2910 ) of a first user interface of a third set of user interfaces. 
     In some embodiments, the processing unit  2908  is further configured to: while displaying the first user interface of the first set of user interfaces, receive (e.g., with receiving unit  2912 ) user input representing a third contact associated with an affordance of the first user interface of the first set of user interfaces; and in response to receiving the third contact, cease display (e.g., with display ceasing unit  2916 ) of the first user interface of a first set of user interfaces and enable display (e.g., with display enabling unit  2910 ) of a second user interface of the first set of user interfaces. 
     In some embodiments, the processing unit  2908  is further configured to: while displaying a user interface of a set of user interfaces, receive (e.g., with receiving unit  2912 ) user input representing a fourth contact on the touch-sensitive surface; determine (e.g., with determining unit  2914 ) whether a characteristic intensity of the fourth contact exceeds a second intensity threshold; in accordance with a determination that the characteristic intensity of the fourth contact exceeds the second intensity threshold, enable display (e.g., with display enabling unit  2910 ) of a second set of affordances; receive (e.g., with receiving unit  2912 ) user input representing a fifth contact associated with an affordance of the second set of affordances; in response to receiving the fifth contact, cease display (e.g., with display ceasing unit  2916 ) of the second set of affordances and enable display (e.g., with display enabling unit  2910 ) of the audio playback user interface; and in accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold, forgo display (e.g., with display forgoing unit  2918 ) of the second set of affordances. 
     In some embodiments, the first set of user interfaces, the second set of user interfaces, and the third set of user interfaces are each independently selected from the group consisting of: a playlist set of user interfaces, an artist set of user interfaces, and a songs set of user interfaces; the playlist set of user interfaces comprises: a playlist user interface, and a list of songs associated with a playlist of the playlist user interface; the artist set of user interfaces comprises: an artist user interface, a list of albums associated with an artist of the artist user interface, and a list of songs associated with an album of the list of albums; and the songs set of user interfaces comprises: a song user interface. 
     The operations described above with reference to  FIG. 16  are, optionally, implemented by components depicted in  FIGS. 1A-1B  or  FIG. 29 . For example, display operation at block  1602 , receive operation at block  1604 , determine operation at block  1606 , cease display and display operation at block  1608 , receive operation at block  1610 , cease display and display operation at block  1612 , and forgo display operation at block  1614  may be implemented by event sorter  170 , event recognizer  180 , and event handler  190 . Event monitor  171  in event sorter  170  detects a contact on touch-sensitive display  112 , and event dispatcher module  174  delivers the event information to application  136 - 1 . A respective event recognizer  180  of application  136 - 1  compares the event information to respective event definitions  186 , and determines whether a first contact at a first location on the touch-sensitive surface corresponds to a predefined event or sub event, such as activation of an affordance on a user interface. When a respective predefined event or sub-event is detected, event recognizer  180  activates an event handler  190  associated with the detection of the event or sub-event. Event handler  190  may utilize or call data updater  176  or object updater  177  to update the application internal state  192 . In some embodiments, event handler  190  accesses a respective GUI updater  178  to update what is displayed by the application. Similarly, it would be clear to a person having ordinary skill in the art how other processes can be implemented based on the components depicted in  FIGS. 1A-1B . 
     In accordance with some embodiments,  FIG. 30  shows a functional block diagram of an electronic device  3000  configured in accordance with the principles of the various described embodiments. The functional blocks of the device are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described embodiments. It is understood by persons of skill in the art that the functional blocks described in  FIG. 30  are, optionally, combined or separated into sub-blocks to implement the principles of the various described embodiments. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     As shown in  FIG. 30 , an electronic device  3000  includes a display unit  3002  configured to display a graphic user interface, a rotatable input mechanism unit  3004  configured to receive movements, a touch-sensitive surface unit  3006  configured to receive contacts, and a processing unit  3008  coupled to the display unit  3002 , the rotatable input mechanism unit  3004 , and the touch-sensitive surface unit  3006 . In some embodiments, the processing unit  3008  includes a display enabling unit  3010 , a receiving unit  3012 , a determining unit  3014 , a display ceasing unit  3016 , and a display forgoing unit  3018 . 
     The processing unit  3008  is configured to: enable display (e.g., with display enabling unit  3010 ) of a first audio playback user interface; receive (e.g., with receiving unit  3012 ) user input representing a first movement of the rotatable input mechanism; in response to receiving the user input representing the first movement of the rotatable input mechanism, cease display (e.g., with display ceasing unit  3016 ) of the first audio playback user interface and enable display (e.g., with display enabling unit  3010 ) of a first user interface of a first set of user interfaces; while displaying a user interface of the first set of user interfaces, receive (e.g., with receiving unit  3012 ) user input representing a first contact on the touch-sensitive surface. The processing unit  3008  is further configured to determine (e.g., with determining unit  3014 ) whether a characteristic intensity of the first contact exceeds an intensity threshold; in accordance with a determination that the characteristic intensity of the first contact exceeds the intensity threshold, cease display (e.g., with display ceasing unit  3016 ) of first set of user interfaces and enable display (e.g., with display enabling unit  3010 ) of a first set of affordances; receive (e.g., with receiving unit  3012 ) user input associated with a first affordance of the first set of affordances; in response to receiving the user input associated with the first affordance of the first set of affordances, cease display (e.g., with display ceasing unit  3016 ) of the first set of affordances and enable display (e.g., with display enabling unit  3010 ) of a first user interface of a second set of user interfaces; and in accordance with a determination that the characteristic intensity of the first contact does not exceed the intensity threshold, forgo display (e.g., with display forgoing unit  3018 ) of the first set of affordances. 
     In some embodiments, the processing unit  3008  is further configured to: while displaying a user interface of the second set of user interfaces, receive (e.g., with receiving unit  3012 ) user input representing a second contact on the touch-sensitive surface; determine (e.g., with determining unit  3014 ) whether a characteristic intensity of the second contact exceeds a second intensity threshold; in accordance with a determination that the characteristic intensity of the second contact exceeds the second intensity threshold, cease display (e.g., with display ceasing unit  3016 ) of the second set of user interfaces and enable display (e.g., with display enabling unit  3010 ) of a second set of affordances; receive (e.g., with receiving unit  3012 ) user input associated with a first affordance of the second set of affordances; in response to receiving the user input associated with the first affordance of the second set of affordances, cease display (e.g., with display ceasing unit  3016 ) of the second set of affordances and enable display (e.g., with display enabling unit  3010 ) of a first user interface of a third set of user interfaces; and in accordance with a determination that the characteristic intensity of the second contact does not exceed the second intensity threshold, forgo displaying (e.g., with display forgoing unit  3018 ) the second set of affordances. 
     In some embodiments, the first user interface of the third set of user interfaces comprises a selection affordance, and the processing unit  3008  is further configured to: receive (e.g., with receiving unit  3012 ) user input associated with the selection affordance of the first user interface of the third set of user interfaces; and in response to receiving the user input associated with the selection affordance of the first user interface of the third set of user interfaces, cease display (e.g., with display ceasing unit  3016 ) of the third set of affordances and enable display (e.g., with display enabling unit  3010 ) of a second audio playback user interface. 
     In some embodiments, the processing unit  3008  is further configured to: while displaying a user interface of the third set of user interfaces, receive (e.g., with receiving unit  3012 ) user input representing a third contact on the touch-sensitive surface; determine (e.g., with determining unit  3014 ) whether a characteristic intensity of the third contact exceeds the intensity threshold; in accordance with a determination that the characteristic intensity of the third contact exceeds the intensity threshold, cease display (e.g., with display ceasing unit  3016 ) of the third set of user interfaces and enabling display (e.g., with display enabling unit  3010 ) of a third set of affordances. The processing unit  3008  is further configured to receive (e.g., with receiving unit  3012 ) user input associated with a first affordance of the third set of affordances; in response to receiving the user input associated with the first affordance of the third set of affordances, cease display (e.g., with display ceasing unit  3016 ) of the third set of affordances and enable display (e.g., with display enabling unit  3010 ) of a most-recently-displayed user interface of the first set of user interfaces; and in accordance with a determination that the characteristic intensity of the third contact does not exceed the intensity threshold, forgo (e.g., with display forgoing unit  3016 ) displaying the third set of affordances. 
     In some embodiments, the processing unit  3008  is further configured to: receive (e.g., with receiving unit  3012 ) user input representing a second movement of the rotatable input mechanism; and in response to receiving the user input representing the second movement of the rotatable input mechanism, enable display (e.g., with display enabling unit  3010 ) of the first audio playback user interface. 
     In some embodiments, the first set of user interfaces, the second set of user interfaces, and the third set of user interfaces are each independently selected from the group consisting of: a playlist set of user interfaces, an artist set of user interfaces, and a songs set of user interfaces; the playlist set of user interfaces comprises: a playlist user interface, and a list of songs associated with a playlist of the playlist user interface; the artist set of user interfaces comprises: an artist user interface, a list of albums associated with an artist of the artist user interface, and a list of songs associated with an album of the list of albums; and the songs set of user interfaces comprises: a song user interface. 
     The operations described above with reference to  FIG. 18  are, optionally, implemented by components depicted in  FIGS. 1A-1B  or  FIG. 30 . For example, display operation at block  1802 , receive operation at block  1804 , cease display and display operation at block  1806 , receive operation at block  1808 , determine operation at block  1810 , cease display and display operation at block  1812 , receive operation at block  1814 , cease display and display operation at block  1816 , and forgo display operation at block  1818  may be implemented by event sorter  170 , event recognizer  180 , and event handler  190 . Event monitor  171  in event sorter  170  detects a contact on touch-sensitive display  112 , and event dispatcher module  174  delivers the event information to application  136 - 1 . A respective event recognizer  180  of application  136 - 1  compares the event information to respective event definitions  186 , and determines whether a first contact at a first location on the touch-sensitive surface corresponds to a predefined event or sub event, such as activation of an affordance on a user interface. When a respective predefined event or sub-event is detected, event recognizer  180  activates an event handler  190  associated with the detection of the event or sub-event. Event handler  190  may utilize or call data updater  176  or object updater  177  to update the application internal state  192 . In some embodiments, event handler  190  accesses a respective GUI updater  178  to update what is displayed by the application. Similarly, it would be clear to a person having ordinary skill in the art how other processes can be implemented based on the components depicted in  FIGS. 1A-1B . 
     In accordance with some embodiments,  FIG. 31  shows a functional block diagram of an electronic device  3100  configured in accordance with the principles of the various described embodiments. The functional blocks of the device are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described embodiments. It is understood by persons of skill in the art that the functional blocks described in  FIG. 31  are, optionally, combined or separated into sub-blocks to implement the principles of the various described embodiments. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     As shown in  FIG. 31 , an electronic device  3100  includes a display unit  3102  configured to display a graphic user interface, a rotatable input mechanism unit  3104  configured to receive movements (e.g., rotations), and a processing unit  3108  coupled to the display unit  3102  and the rotatable input mechanism unit  3104 . In some embodiments, the processing unit  3108  includes a display enabling unit  3110 , a receiving unit  3112 , and a display ceasing unit  3114 . 
     The processing unit  3108  is configured to: enable display (e.g., with display enabling unit  3110 ) of a first audio application user interface; while displaying the first audio application user interface, receive (e.g., with receiving unit  3112 ) a first user input representing movement of the rotatable input mechanism in a rotation direction; in response to receiving the first user input, cease display (e.g., with display ceasing unit  3114 ) of the first audio application user interface and enable display (e.g., with display enabling unit  3110 ) of a second audio application user interface; while displaying the second audio application user interface, receive (e.g., with receiving unit  3112 ) a second user input representing movement of the rotatable input mechanism in the rotation direction; and in response to receiving the second user input, cease display (e.g., with display ceasing unit  3114 ) of the second audio application user interface and enable display (e.g., with display enabling unit  3110 ) of a third audio application user interface. 
     In some embodiments, the processing unit  3108  is further configured to: while displaying the third audio application user interface, receive (e.g., with receiving unit  3112 ) a third user input representing movement of the rotatable input mechanism in the rotation direction; and in response to receiving the third user input, cease display (e.g., with display ceasing unit  3114 ) of the third audio application user interface and enable display (e.g., with display enabling unit  3110 ) of a fourth audio application user interface. 
     In some embodiments, the processing unit  3108  is further configured to: while displaying the fourth audio application user interface, receive (e.g., with receiving unit  3112 ) a fourth user input representing movement of the rotatable input mechanism in the rotation direction; and in response to receiving the fourth user input, cease display (e.g., with display ceasing unit  3114 ) of the fourth audio application user interface and enable display (e.g., with display enabling unit  3110 ) of a fifth audio application user interface. 
     In some embodiments, one of the first, second, or third audio application user interfaces is an audio playback user interface comprising an affordance for initiating audio playback. 
     In some embodiments, one of the first, second, or third audio application user interfaces is an albums list user interface. 
     In some embodiments, the processing unit  3108  is further configured to: while displaying one of the first, second, or third audio application user interfaces, receive (e.g., with receiving unit  3112 ) user input representing a first selection of an affordance of the displayed audio application user interface; and in response to receiving the user input representing the first selection, cease display (e.g., with display ceasing unit  3114 ) of one of the first, second, or third audio application user interfaces and enable display (e.g., with display enabling unit  3110 ) of a detail user interface, wherein the detail user interface comprises content based on the affordance selected by the first selection. 
     In some embodiments, the processing unit  3108  is further configured to: while displaying one of the first, second, or third audio application user interfaces, receive (e.g., with receiving unit  3112 ) user input representing a second selection of a playlist affordance associated with a playlist; and in response to receiving the user input representing the second selection, cease display (e.g., with display ceasing unit  3114 ) of one of the first, second, or third audio application user interfaces and enable display (e.g., with display enabling unit  3110 ) of a list of songs, wherein the list of songs is based on the playlist. 
     In some embodiments, the processing unit  3108  is further configured to: while displaying one of the first, second, or third audio application user interfaces, receive (e.g., with receiving unit  3112 ) user input representing a third selection of an artist affordance associated with an artist; and in response to receiving the user input representing the third selection, cease display (e.g., with display ceasing unit  3114 ) of one of the first, second, or third audio application user interfaces and enable display (e.g., with display enabling unit  3110 ) of a list of albums, wherein the list of albums is based on the artist. 
     In some embodiments, the first audio application user interface, the second audio application user interface, the third audio application user interface, the fourth audio application user interface, and the fifth audio application user interface are each independently selected from the group consisting of: a playlists user interface, an artist user interface, a song user interface, an albums user interface, and an audio playback user interface. 
     In some embodiments, the playlists user interface comprises: a list of songs associated with a playlist of the playlist list user interface; and the artist user interface comprises: an artist list user interface, a list of albums associated with an artist of the artist list user interface, and a list of songs associated with an album of the list of albums. 
     In some embodiments, the first, second, and third audio application user interfaces are each different. 
     The operations described above with reference to  FIG. 20  are, optionally, implemented by components depicted in  FIGS. 1A-1B  or  FIG. 31 . For example, display operation at block  2002 , receive operation at block  2004 , cease display and display operation at block  2006 , receive operation at block  2008 , and cease display and display operation at block  2010  may be implemented by event sorter  170 , event recognizer  180 , and event handler  190 . Event monitor  171  in event sorter  170  detects a contact on touch-sensitive display  112 , and event dispatcher module  174  delivers the event information to application  136 - 1 . A respective event recognizer  180  of application  136 - 1  compares the event information to respective event definitions  186 , and determines whether a first contact at a first location on the touch-sensitive surface corresponds to a predefined event or sub event, such as activation of an affordance on a user interface. When a respective predefined event or sub-event is detected, event recognizer  180  activates an event handler  190  associated with the detection of the event or sub-event. Event handler  190  may utilize or call data updater  176  or object updater  177  to update the application internal state  192 . In some embodiments, event handler  190  accesses a respective GUI updater  178  to update what is displayed by the application. Similarly, it would be clear to a person having ordinary skill in the art how other processes can be implemented based on the components depicted in  FIGS. 1A-1B . 
     In accordance with some embodiments,  FIG. 32  shows a functional block diagram of an electronic device  3200  configured in accordance with the principles of the various described embodiments. The functional blocks of the device are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described embodiments. It is understood by persons of skill in the art that the functional blocks described in  FIG. 32  are, optionally, combined or separated into sub-blocks to implement the principles of the various described embodiments. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     As shown in  FIG. 32 , an electronic device  3200  includes a display unit  3202  configured to display a graphic user interface, a rotatable input mechanism unit  3204  configured to receive movements, a touch-sensitive surface unit  3206  configured to receive contacts, and a processing unit  3208  coupled to the display unit  3202 , the rotatable input mechanism unit  3204 , and the touch-sensitive surface unit  3206 . In some embodiments, the processing unit  3208  includes a display enabling unit  3210 , a receiving unit  3212 , a display ceasing unit  3214 , and a display replacing unit  3216 . 
     The processing unit  3208  is configured to: enable display (e.g., with display enabling unit  3210 ) of a first audio playback user interface; while displaying the first audio playback user interface, receive (e.g., with receiving unit  3212 ) a first user input representing movement of the rotatable input mechanism; in response to receiving the first user input, cease display (e.g., with display ceasing unit  3214 ) of the first audio playback user interface and enable display (e.g., with display enabling unit  3210 ) of a first user interface of a first set of user interfaces; while displaying a user interface of the first set of user interfaces, receive (e.g., with receiving unit  3212 ) a second user input representing a swipe in a first direction; in response to receiving the second user input, replace display (e.g., with display replacing unit  3216 ) of a portion of the user interface of the first set of user interfaces with display of a navigation interface, wherein the navigation interface comprises a first navigation affordance associated with the first set of user interfaces and a second navigation affordance associated with a second set of user interfaces. The processing unit  3208  is further configured to: receive (e.g., with receiving unit  3212 ) a third user input associated with the second navigation affordance of the navigation interface; and in response to receiving the third user input, cease display (e.g., with display ceasing unit  3214 ) of the first set of user interfaces and the navigation interface and enable display (e.g., with display enabling unit  3210 ) of a first user interface of the second set of user interfaces. 
     In some embodiments, the processing unit  3208  is further configured to: while displaying a user interface of the second set of user interfaces, receive (e.g., with receiving unit  3212 ) a fourth input representing a swipe in the first direction; in response to receiving the fourth user input, enable display (e.g., with display enabling unit  3210 ) of the navigation interface, wherein the navigation interface further comprises a third navigation affordance associated with a third set of user interfaces. The processing unit  3208  is further configured to: receive (e.g., with receiving unit  3212 ) a fifth user input associated with the third navigation affordance of the navigation interface; and in response to receiving the fifth user input, cease display (e.g., with display ceasing unit  3214 ) of the second set of user interfaces and the navigation interface and enable display (e.g., with display enabling unit  3210 ) of a first user interface of the third set of user interfaces. 
     In some embodiments, the processing unit  3208  is further configured to: receive (e.g., with receiving unit  3212 ) a sixth user input representing movement of the rotatable input mechanism; and in response to receiving the sixth user input, enable display (e.g., with display enabling unit  3210 ) of the first audio playback user interface. 
     In some embodiments, the processing unit  3208  is further configured to: while displaying a user interface of any of the first set of user interfaces, the second set of user interfaces, or the third set of user interfaces, receive (e.g., with receiving unit  3212 ) a seventh user input associated with a selection affordance of the user interface of any of the first set of user interfaces, the second set of user interfaces, or the third set of user interfaces; and in response to receiving the seventh user input, enable display (e.g., with display enabling unit  3210 ) of a second audio playback user interface. 
     In some embodiments, the first set of user interfaces, the second set of user interfaces, and the third set of user interfaces are each independently selected from the group consisting of: a playlist set of user interfaces, an artist set of user interfaces, and a songs set of user interfaces; the playlist set of user interfaces comprises: a playlist user interface, and a list of songs associated with a playlist of the playlist user interface; the artist set of user interfaces comprises: an artist user interface, a list of albums associated with an artist of the artist user interface, and a list of songs associated with an album of the list of albums; and the songs set of user interfaces comprises: a song user interface. 
     The operations described above with reference to  FIG. 22  are, optionally, implemented by components depicted in  FIGS. 1A-1B  or  FIG. 32 . For example, display operation at block  2202 , receive operation at block  2204 , cease display and display operation at block  2206 , receive operation at block  2208 , replace display operation at block  2210 , receive operation at block  2212 , and cease display and display operation at block  2214  may be implemented by event sorter  170 , event recognizer  180 , and event handler  190 . Event monitor  171  in event sorter  170  detects a contact on touch-sensitive display  112 , and event dispatcher module  174  delivers the event information to application  136 - 1 . A respective event recognizer  180  of application  136 - 1  compares the event information to respective event definitions  186 , and determines whether a first contact at a first location on the touch-sensitive surface corresponds to a predefined event or sub event, such as activation of an affordance on a user interface. When a respective predefined event or sub-event is detected, event recognizer  180  activates an event handler  190  associated with the detection of the event or sub-event. Event handler  190  may utilize or call data updater  176  or object updater  177  to update the application internal state  192 . In some embodiments, event handler  190  accesses a respective GUI updater  178  to update what is displayed by the application. Similarly, it would be clear to a person having ordinary skill in the art how other processes can be implemented based on the components depicted in  FIGS. 1A-1B . 
     The foregoing description, for purpose of explanation, has been described with reference to specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in view of the above teachings. The embodiments were chosen and described in order to best explain the principles of the techniques and their practical applications. Others skilled in the art are thereby enabled to best utilize the techniques and various embodiments with various modifications as are suited to the particular use contemplated. 
     Although the disclosure and examples have been fully described with reference to the accompanying drawings, it is to be noted that various changes and modifications will become apparent to those skilled in the art. Such changes and modifications are to be understood as being included within the scope of the disclosure and examples as defined by the claims.

Metadata:
Filing Date: 20150819
Publication Date: 20190319
Grant Date: 20190319
Priority Date: 20140902
Inventors: YANG, LAWRENCE Y.
GRAHAM, DAVID CHANCE
FOSS, CHRISTOPHER PATRICK
DAVYDOV, ANTON M.
DYE, ALAN C.
IVE, JONATHAN P.
LEMAY, STEPHEN O.
Assignee: APPLE INC
CPC Classifications: [{"code": "G06F3/04842", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/04847", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0481", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0488", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F17/30775", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0482", "inventive": true, "first": true, "tree": "[]"}, {"code": "G06F3/04847", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/04842", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0481", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F16/64", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04N21/41265", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F2203/04105", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/0421", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/04883", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/016", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04N21/478", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04N21/4825", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04N21/42204", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04N21/8113", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0488", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/04847", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/04842", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0481", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04N21/41265", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/04883", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F2203/04105", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/0421", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/016", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0488", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04N21/8113", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04N21/4825", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04N21/478", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04N21/42204", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0482", "inventive": true, "first": true, "tree": "[]"}, {"code": "G06F3/0482", "inventive": true, "first": true, "tree": "[]"}]
Family ID: 54105983