That CPS2 hardware just sounds different. Super Street Fighter II pushed Capcom's sound team, led by Yoko Shimomura and Isao Abe among others, into reworking every character theme with richer samples and punchier drums. Ken's stage theme got this urgency boost that makes the original feel like a rough draft.
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Dee Jay's stage is pure dancehall energy compressed into arcade chip format, while Cammy's theme has that military tension running through every note. Fei Long's track channels Bruce Lee movie scores through 16-bit processing.
The character ending themes carry more weight than you'd expect from a fighting game. If you grew up pumping quarters into this cabinet, these tracks still go harder than half of modern gaming's output.