The Sanada Maru spinoff zeroed in on one clan's story and the soundtrack got way more personal because of it. Samurai Warriors: Spirit of Sanada trades the usual wall-of-sound Musou approach for something that actually breathes.
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Twin Cherry Blossoms is this gorgeous theme that carries the whole emotional weight of the Sanada brothers' bond. Hometown feels warm and lived-in, like a village you'd actually miss leaving. Then Giant Among Men just erupts into this commanding battle theme that sounds bigger than anything on PS3 has a right to.
Japan's Greatest Warriors into Elegy at the end though. Wrecked. If you want a Musou game that actually makes you care about the story between fights, start here.