Finally, i understand what you meant.. you had given me the wrong impression altogether
You should have said music stops looping! Music! (not sound.... Sound entails music, fx, or both..)
I got no issues with that, didn't even think it was a 'bug', lol.. some games, they have music on an infinite loop, which (re: personally speaking of course) drives me coco and nuts so i end up muting it entirely. Other games, they don't have looping, or they have an option for you to disable it.
I honestly thought this was intentional. Wrong, i still -think- this is intentional. If it's not?
No offense man, but i hope they don't fix it

Can be the best(est[est]) soundtrack ever, it goes on ad infinitum, it's just begging to be muted, sooner or later.