I agree with Tahoe, Xenon 2 featured music from Bomb The Bass so was quite a cult thing on Amiga. Funny, I don't remember Xenon 2 being converted to Sega/Nintendo machines, could be wrong though.
Other great music comes from Stardust and Super Stardust, very famous Amiga games.
Monkey Island is another A-list title with atmospheric tunes!
:-)