http://bugs.winehq.org/show_bug.cgi?id=24478
--- Comment #46 from David Finch david@mytsoftware.com 2011-06-05 04:01:31 CDT --- I haven't noticed any side effects yet from commenting out the assertion. No crashes so far, and I still hear background music.
I'm not sure how much background music I'm supposed to hear though, since I've played Fallout 3 and NV only on Wine. And I did have one instance of background music from one area (Freeside) continuing to play after teleporting to a different area (Goodsprings), but I don't know if that's related, and I couldn't get it to happen again.