That piano in Route 209 lives in your head rent free whether you want it to or not. Diamond & Pearl pushed the DS hardware into this weird sweet spot where the MIDI sounds almost orchestral but still crunchy enough to feel like a game.
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Twinleaf Town's day theme is gentle and nostalgic before you've even done anything worth being nostalgic about. The rival battle theme is frantic, almost jazz-influenced. "Lake" is three minutes of ambient calm that genuinely belongs on a lo-fi playlist.
Then Dialga and Palkia's battle themes hit like a truck. Jubilife City bouncing along at night... Sinnoh kids already know, but if you skipped Gen 4, your ears are missing out.