Did you know the soundtrack was composed in a module tracker? Someone recently recorded the full soundtrack playing back in Milkytracker. Pretty neat since you can see how the composers wrote the songs.
And you could use a utility called umr (unreal media reaper) to extract the songs. It was mind blowing to then understand how the game switched patterns to suit the pace, a very clever use of this technology.
I listen to Foregone Destruction so much that when I play the actual map that uses it I always think I left my music player running in the background.
I don't really understand where the dividing line is between Jungle and Drum and Bass, but I'm pretty sure Foregone Destruction is on the DnB side of it.