Board Thread:Questions and Answers/@comment-15305799-20161107053843/@comment-3421618-20161107134614

The Music Jam glitch is really weird. It's game-breaking for people that have it, but only certain accounts have it for whatever reason and it completely ruins the party for them. If you have the glitch, you're really out of luck- it's not like CP's gonna listen to you or anything.

I believe the CPWN archives have swf files of all the music, so you can just throw the swf onto your web browser and it should play.