You mean in KMOD? You can just extract it from the wadfile. I'm also not sure what's in there, haven't started up KMOD in like years. IIRC it was first something from SkyJake and later a quick one from me, but not sure. Or rather, I think my theme was the music in the shop trailer for KMOD (which I'm not sure whether it was ever released).
Wait, now it's coming back to me, I think it was from Braveheart or something similar and was submitted from a fan, best search this subforum for more info - although the credits in the KMOD readme/doc file should state all authors and all 3rd party resources.