At first you have to choose music play-list to be synchronized. Open “Music”application on iPhone and select “Play-lists” tab.
Then press «New play-list»:
1. iPhone will ask you what tracks you want to add to your new play-list. Press “Ready” after selecting the music.
2. Then comes the most interesting part. Start application Apple Watch on your iPhone and select “Music” section.
3. Choose a limit on storage of music on Apple Watch. For example, install it as one gigabyte. Finally, press «Synchronize play-list»; the process can last some time.
We’ve done! Start “Music” application on Apple Watch by long pressing, select Apple Watch as “Source”. Note that watch has no audio output; therefore you’ll need Bluetooth-earphones.