You can play music through the speaker of your Apple Watch by opening up the Music app on your watch. Your playlist will appear, and you can select a song to start listening to it right away! If you have Bluetooth headphones connected already, they will connect automatically and take over playing any selected songs while in this mode. Swipe up from the bottom of the screen when within an app or swipe the left if at the home screen to use this feature. You will see different options such as "Now Playing," which we want, so tap on that one instead. When "Now Playing" appears, scroll down until you find music controls (they look like two speakers), then press them to turn on music.