The music function of the Garmin Forerunner 265S Music watch allows you to listen to music, but not via an inbuilt speaker. To listen to music, you need to connect Bluetooth headphones.

Here are the steps to connect Bluetooth headphones:
- Bring the headphones within 2 m (6.6 feet) of the watch.
- Activate the pairing mode of the headphones.
- Press and hold the UP button.
- Select "Music" > "Headphones" > "Add New".
- Select the headphones to complete the pairing.

You can listen to music downloaded to the watch from a third-party provider or by controlling music playback on your phone.