MSX2 FM synthesis doing things it has no business doing this well. Xak is one of those late-80s Japanese action RPGs that got a soundtrack way above its weight class, all rendered through the YM2413's limited channels. The town theme for Fairles has this warm, almost nostalgic FM tone that just sits with you.
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"Battle Field" goes hard with rapid arpeggios and a melody line that's genuinely catchy, not just impressive for the hardware. The boss themes against the elementals get surprisingly intense. Pure FM grit. "Blue Sea" is this peaceful interlude that shows real restraint with the chip.
If you're into Ys-era FM soundtracks and haven't explored the MSX side, start here.