The DS sound chip doing things it absolutely should not be capable of. Black & White's soundtrack is where Pokémon music stopped playing it safe and started writing actual compositions, with this expanded version laying everything out in a sequence that feels like a full album.
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"Accumula Town" has that piano groove that turns a random NPC town into a place you want to hang out. The gym leader battle theme builds tension like nothing in the series before it. Route 1 hits different knowing the whole Unova arc ahead.
Nuvema Town is warm in a way that makes you homesick for a pixel village. If Gen 5 passed you by, this score alone is worth the trip back.