Raw PC-88 and PC-98 FM synthesis, the kind that buzzes in your chest. KOEI's Rekishi Sanbusaku is a trilogy of early historical sims from 1990, and this collection gathers all three soundtracks plus their Grade Up versions.
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"Main - Failure" and "Main - Success" from the first game are two sides of the same coin, the FM chip bending mood with just a few channels. "Theme of the Princess" from the second game is genuinely pretty, a soft melody fighting through hardware limitations.
The Grade Up Version Medleys remix the originals into longer, more polished arrangements. You can hear the composers stretching what the PC-88 could do. Each game gets its own arc from opening to unification. If you've ever wondered what KOEI sounded like before consoles, this is where it all started.