Rich PS2 synths blending with acoustic textures right from track one. Atelier Iris: Eternal Mana's original soundtrack from 2004 set the template for what Gust could do with alchemy RPG music. "City of Bells" layers melody on melody until you feel like you are walking through a fantasy cathedral.
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"Alchemic Blast" brings battle energy with punchy rhythms and soaring leads. "Miraculous Little Universe" has this quiet wonder to it that sneaks up on you. The shop themes alone are worth the listen. "Shopping in Kavoc" and "Shopping in Arcose" each have their own personality.
Character pieces like "Klein and His Friends" carry real emotional weight between the action. If you want to understand why people fell in love with the Atelier Iris subseries, start with this OST.