There are several Module products that HAD music, but the music became broken when Fanburst connection went out. At that time, the technique for the module maker was: Upload your music to Fanburst, set up your Game with the music in it, then work with Roll20 Marketplace to install your game as a sellable module. Something similar would probably still be in effect --- populate the Jukebox in your Game with the music, then package that game to sell as a Marketplace Module. However this does not answer how to do so, in the current/new Jukebox and sound-uploading setup. I bet there is a way. Personally I would like to see past Modules that HAD music, restored to fix the music, but I do not know if that will happen. The good news here is that Market Modules have included music before, via Jukebox.