Yes, you can listen to music on your Apple Watch without using your phone. In the Music app, you must first download your playlist or album. Because the Apple Watch lacks a headphone port, Bluetooth headphones should do. The speaker isn't very loud, but it'll work if you're alone at home or waiting someplace without a lot of background noise. It does, however, feature a microphone, which means Siri can be used! Now you can use all of Spotify's capabilities on your Apple Watch! Don't forget to update your iPhone and then go into settings > general > Bluetooth activation; otherwise, it won't work!!