That Ground BGM bass line hitting with a swing feel that no other NES game even attempted. Koji Kondo composed Super Mario Bros. 2 with a completely different energy than the first game, leaning into this almost calypso-inflected rhythm on the 2A03 chip that matched the dreamlike weirdness of Subcon.
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The Underground BGM strips things down to this eerie, minimal groove, while Sub-Space flips into a distorted, slowed version that genuinely unsettled kids in 1988. This complete collection includes the original Doki Doki Panic FDS versions too, so you can hear the subtle differences in channel mixing and tempo.
If you've only ever heard the overworld theme sampled in memes, the full score has way more going on.