The basslines in this game pushed the Mega Drive harder than almost anything else on the hardware. Hirofumi Murasaki, Morihiko Akiyama, and Masayuki Nagao wrote a score for Shinobi III that still sounds impossible coming out of a Genesis.
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Japonesque blends traditional Japanese melody with funk bass and it just goes, like someone figured out how to make the YM2612 chip groove. Idaten is pure adrenaline, all forward momentum. Then Solitary hits and suddenly you're processing actual emotion from 16-bit sound channels.
Data Discs remastered this in 24-bit/96kHz and the clarity makes you hear details you missed for thirty years. If you think you know what Genesis music sounds like, this will recalibrate everything.