The Path of the Warrior: Art of Fighting 3's Arrange Soundtrack. Not only was the entire game a huge gamble (ditching standard combo systems for something similar to 3D games of the time), the arrange soundtrack ended up being a weird jazz / samba mix that is just AMAZING. The mix used in the NeoGeo CD version of the game (and consequently, the PS2 Anthology release) used cut up / looped versions that took out much of the music's awesomeness, but here's a few tracks from the soundtrack album versions.
MOJO (Ramble) MOJO (Boogie) Muzika Jungle (Edition 2) (Sub Boss Stage)
Muzika Jungle (Edition 1) (Final Boss Stage)
Liberation Hallucination (Credits theme, missing a sound effect-only prologue and epilogue to the game's story.)
I have been trying to get a copy of this CD (or at least a FLAC rip) for quite a few years.