I own this game, and I've been... well, tinkering around with it a bit. The ending credits are stored in plain text in one of the files, so I added the performer and composer info listed there.
This soundtrack does not include the Fear Factory and Slipknot tracks - it's missing about half the music in the game between the other licensed stuff, Stymie's
Superfun Teenage Girls (which is used during one of the minigames in edited form) and the entirety of Brad "DJ D-Fault" Fotsch's original score, plus a few tracks that appear to have been taken from library music collections.
That Stymie song is the weirdest one on the entire game - 2/3rds of the game is filled with hip-hop, the other third is metal, and then we have that song. It's still in the game, but it never plays. I guess the devs thought it didn't fit.
