Oh, maybe it was in the movie, but the soundtrack doesn't have anything but Dust Brothers on it.
http://www.amazon.com/Fight-Club-Original-Soundtrack/dp/B002LQI738/ref=sr_1_2?ie=UTF8&s=dmusic&qid=1254430442&sr=8-2
1. Who Is Tyler Durden? (Album Version) Dust Brothers
2. Homework (Album Version) Dust Brothers
3. What Is Fight Club? (Album Version0 Dust Brothers
4. Single Serving Jack (Album Version) Dust Brothers
5. Corporate World (Album Version) Dust Brothers
6. Psycho Boy Jack (Album Version) Dust Brothers
7. Hessel, Raymond K. (Album Version) Dust Brothers
8. Medulla Oblongata (Album Version) Dust Brothers
9. Jack's Smirking Revenge (Album Version) Dust Brothers
10. Stealing Fat (Album Version) Dust Brothers
11. Chemical Burn (Album Version) Dust Brothers
12. Marla (Album Version) Dust Brothers
13. Commissioner Castration (Album Version) Dust Brothers
14. Space Monkeys (Album Version) Dust Brothers
15. Finding The Bomb (Album Version) Dust Brothers
16. This Is Your Life (featuring Tyler Durden) (Album Version) The Dust Brothers (featuring Tyler Durden)