I haven't thought about Realmz in a long-ass time. It had some really crazy tracks and was the only game I know of that used MOD instead of MIDI for its music.
Deus Ex Used MOD, At least I think they were mod, There were a fair number of what was basically MIDI + samples formats.
Also while trying to get my facts straight (All I remember was trying to find a mod player to play the deus ex music found on the cd) apparently Unreal tournament and tyrian2000 used mod music as well, Someone at Epic Megagames must have liked them.
Oh man you're right. How could I forget about Unreal Tournament? I totally forget that mod player I found, but it was fun to cobble together playlists.
By the way if you liked the Deus Ex soundtrack you can check out the Sonic Augmentation ocremix album. Really good.