Hello QLib, thanks for reaching out! If your smart watch has a built-in speaker, you can play music right from your watch. If it doesn't, don't worry! All you need to do is connect Bluetooth headphones. Simply add and remove tracks to build the perfect playlist! If you prefer streaming, you can do that too with a Spotify premium account. This watch also automatically records your sleep using motion data or heart rate. You can use the Record REM sleep feature to manage how the watch measures your sleep. When the switch is on, your sleep stages will be measured based on your heart rate. When off, your sleep pattern will be measured based on body movement. ^Elizabeth