Like the title says, are there any rules on music? I've read that you need to hear the game audio but would some low volume music be a problem? Low enough that you can hear game audio over it.

Yes you can listen to music its not a problem ;)

@splatoon 3 Listening to music while playing new games makes me more inspired.

@geometry dash lite, I feel the same way, listening to music helps me relax and play game better!

@bitlife I too feel this same; listening to music calms me and improves my gaming performance!