A method comprising: displaying an area on a user interface of a controller, the area associated with an artist name, an album name, and a track name associated with an audio track that is being played by one or more playback devices controlled by the controller, wherein the one or more playback devices comprises a first playback device communicatively coupled to the controller via a local area network; receiving a selection of a location in the area of the user interface, wherein the location is associated with at least one of an artist name, an album name, and a track name; responsive to receiving the selection of the location, identifying by the controller at least two audio sources from which audio content may be directly retrieved by the first playback device for playback, wherein identifying the at least two audio sources comprises requesting by the controller, from the first playback device via the local area network, information associated with the at least two audio sources stored on a memory of the first playback device, wherein the memory of the first playback device comprises a list of audio sources from which audio content may be directly retrieved by the first playback device for playback, wherein the at least two audio sources include: at least one streaming audio service from which audio content may be retrieved via a wide area network, and a media library comprising media items that may be retrieved by the first playback device via the local area network for playback; searching the at least one streaming audio service and the media library based on at least one search classification field supported by the at least two audio sources for any of the artist name, the album name, and the track name associated with the selected location; retrieving, by the controller from the at least two audio sources based on the search, information related to at least one of the artist name, the album name, and the track name; grouping the search results into groups corresponding to the at least two audio sources, respectively; sorting the search results for a particular audio source based on the at least one search classification field; and displaying the grouped and sorted information on the user interface. displaying an area on a user interface of a controller, the area associated with an artist name, an album name, and a track name associated with an audio track that is being played by one or more playback devices controlled by the controller, wherein the one or more playback devices comprises a first playback device communicatively coupled to the controller via a local area network; receiving a selection of a location in the area of the user interface, wherein the location is associated with at least one of an artist name, an album name, and a track name; responsive to receiving the selection of the location, identifying by the controller at least two audio sources from which audio content may be directly retrieved by the first playback device for playback, wherein identifying the at least two audio sources comprises requesting by the controller, from the first playback device via the local area network, information associated with the at least two audio sources stored on a memory of the first playback device, wherein the memory of the first playback device comprises a list of audio sources from which audio content may be directly retrieved by the first playback device for playback, wherein the at least two audio sources include: at least one streaming audio service from which audio content may be retrieved via a wide area network, and a media library comprising media items that may be retrieved by the first playback device via the local area network for playback; at least one streaming audio service from which audio content may be retrieved via a wide area network, and a media library comprising media items that may be retrieved by the first playback device via the local area network for playback; searching the at least one streaming audio service and the media library based on at least one search classification field supported by the at least two audio sources for any of the artist name, the album name, and the track name associated with the selected location; retrieving, by the controller from the at least two audio sources based on the search, information related to at least one of the artist name, the album name, and the track name; grouping the search results into groups corresponding to the at least two audio sources, respectively; sorting the search results for a particular audio source based on the at least one search classification field; and displaying the grouped and sorted information on the user interface.