The DS speakers are doing things they shouldn't be able to do on this one. Tales of Innocence pushed Motoi Sakuraba into writing for limited hardware and he absolutely made it work. "Follow the Nightingale" opens with this vocal arrangement that has no business sounding that clean on a handheld.
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Then "Memory of the Music Box" hits with this delicate, almost fragile melody that just sits with you. The battle themes go hard too, "Break Through with the Sword" keeps that classic Sakuraba energy, all fast arpeggios and intensity crammed into tiny speakers.
Something about the compression actually adding texture. If you're into the Tales series and skipped this DS entry, the soundtrack alone makes it worth tracking down.