Restore steam music player
The new update removed the Steam Music Player, here is how to get it back. Alternatively, try this method: • Restore Steam Music Player AGAIN | HACK
Message from Steam regarding Steam Music Player:
Thank you for contacting Steam Support.
However, there is no longer an independent music player and you will need to install the soundtrack through Steam.
Additionally, you can access/play the soundtrack through the Steam Overlay.
Steam Support