EQ used some sort of proprietary file for its music, although I think it was really just midi music converted to a different format so people couldn't easily listen to it out-of-game. An old EQ patch note for EQ suggests that most users heard pre-rendered music, although users with SBLive! or AWE32 cards got something different. If you can remember what hardware you had in 1999/2001 that'll let you know what you want to hunt for on youtube/elsewhere.
Danth
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