https://bugs.winehq.org/show_bug.cgi?id=41345
--- Comment #9 from Philipp Ludwig philipp.ludwig@gmail.com --- Could there be another way to figure out what the problem is? As stated in the initial report, the music works in the menu, but not in-game.
Maybe some codec or something similar is missing; since the game uses it's own packaging format for the data files, it is hard to tell in which format the music is saved.