Open the Google Play Store on your smartwatch, then search for Google Play Music. Download the Play Music watch app. You must have a paid subscription to download music directly to your smartwatch.
Connect your smartwatch to Wi-Fi in the Connectivity section of Settings. Open Play Music, then make sure the Google account synced to your smartwatch is tied to a paid subscription. Tap the download icon next to songs, playlists, and albums you want to save to your smartwatch.
When the music is downloaded, you’ll see a check mark next to it. To delete a download, tap the check mark.
Connect to Bluetooth headphones in the Connectivity section of Settings, then play any of your downloaded music to enjoy songs phone free.