Joe Hisaishi scored a JRPG and it sounds exactly as incredible as you're imagining. Ni no Kuni: Wrath of the White Witch on PS3 features a full orchestral soundtrack performed by the Tokyo Philharmonic that rivals his best Ghibli work.
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The Main Theme carries that signature Hisaishi warmth, strings building into a melody that stays with you for weeks. One Fine Morning and Motorville ground you in this small-town innocence before In Loving Memory of Allie rips the floor out emotionally.
The world map theme is genuinely one of the best overworld tracks in any RPG, period. Ding Dong Dell bounces with playful energy while Shadar's theme brings real orchestral menace. That transition from crisis to Miracle Reunion.
If you play JRPGs and haven't heard Hisaishi work within the genre, you owe yourself this.