Stream Apple Music on You Apple Watch
If you want to stream directly from your Apple Watch, you can subscribe to Apple Music, and get the Apple Watch with LTE and activate it on your cell phone plan.
This newer Apple Watch allows you to stream the 40 million songs from Apple Music on your watch, directly to your AirPods or Bluetooth headphones anywhere you have a cell phone connection.
Instead of syncing the music you want and planning ahead, you can dial in the right music for your workout or walk when you are on the go. This only works on the new Apple Watch 3 or newer.