Punchy PS1-era beats with that unmistakable late 90s fighting game energy. 1on1 came out in 1999 on PlayStation and every character gets their own stage theme, which is exactly how fighting game OSTs should work. Kirin's Stage Theme has this tight groove that immediately gets you locked in.
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Run opens the whole thing with raw momentum. Saturday Rainy Day is surprisingly mellow for a fighter, almost jazzy. Then the arrange versions of the stage themes hit different, like they took the originals and cranked up the production.
Every character's ending theme has its own personality too. Ron's feels triumphant, Luka's feels bittersweet. If you ever wanted a PS1 fighter soundtrack that actually slaps per-character, this is the one.