Now that I finally got the play the game a little bit I'm also noticing that there are some problems with the music in the game. I just played through the second mission (main game) and it had the game's intro theme looping over and over.
I guess I'm going to try renaming the song files.

I had a strange problem too: music was playing over some of the cinematics, even though it's not supposed to. Kinda annoying when you try to hear the actual music and dialogue of the cinematic and different music is looping over it.

Yup, this happens too sometimes.
Also I don't remember music stopping after the track is finished and then starting again. The music used to play uninterruptedly. Maybe it's because there's no CD audio but only MP3 tracks.

Same here dude. I can't hear what anyone is saying.

Oh great. I reinstalled Windows 7, and the game and all my sound drivers etc, but the in-game music fails to work anymore. Ack!

Yeah I have this problem too and can't figure out a work around, save for turning off the music once the mission ends.