Falcom went and made an entire ARPG soundtrack built around one waltz motif and it works stupidly well. XANADU NEXT's score by Falcom Sound Team jdk keeps rearranging "La Valse Pour Xanadu" across every context, from field exploration to combat, and each version hits differently.
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"Clover Ruins" has this melancholy string loop that sticks in your head for days, and then "The Castle of Strange Rock" flips the mood into something tense and brooding. The way "Two Love" bookends the whole thing with its variations.
Really ties everything together emotionally. If you played Ys but skipped this one, you're missing some of Falcom's sharpest melodic writing from that mid-2000s era.