Steam Music Beta [Discussion Thread]

Hey guys. I'm making this thread for discussions, as I saw I had access to the closed beta myself just a minute go.
To those, who don't know what is Steam Music: Click here

I'll post feedback after few days, so I can fully test it and not just post first impressions.

EDIT: To those, who don't believe: Proof
EDIT2: Seems to work with on-device music only, even my steam folder has special folder named "Music". Tested it and works well for now.

Bugs found:

• If you exit Big Picture, music keeps working.
• Music Volume won't work sometimes, I cannot tell how to reproduce it, seems it appears randomly
• If the song (or whole library, except 1 song) is missing pictures, the player adds the same picture to all the songs