That steel drum hit on the Ground BGM is permanently lodged in your brain whether you want it there or not. Koji Kondo's Super Mario World score is one of those rare soundtracks where almost every track is a variation on the same theme, and it never gets old.
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Hop on Yoshi and the bongos kick in, adding this whole extra rhythmic layer to tracks you already know. "Athletic BGM" is pure momentum, all bouncy syncopation pushing you forward. The Ghost House theme goes minor and eerie without losing that Kondo playfulness.
Even the map screens each have their own personality. If you grew up with a SNES, this is the soundtrack that taught you what video game music could be.