In watchOS 3, music syncing was limited to one playlist. In watchOS 4, you can now add multiple playlists, individual albums, and your “Heavy Rotation” playlist. The Heavy Rotation playlist is made up of playlists and albums you’ve been listening to recently. Once synced, you can listen to your music without being paired to your iPhone (using AirPods on a run is a great example).
In the Apple Watch iPhone app, tap Music. Next, tap Add Music to select songs, albums, or playlists. You can also have it automatically add items on your Heavy Rotation playlist from here. The Watch will only sync music when you are charging it, though.
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