So, @Xkeeper found the music frequency tables in Super Mario Bros. 2 a few days ago.
<Xk> Let's see what happens when we swap the values in reverse order.
<Xk> ...
<me> ... oh dear.
Here's what we got:
https://www.youtube.com/watch?v=RBpfImpTT5Y
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@Raspberryfloof It does sound nice to me for whatever reason. What do those music frequencies do anyway? Is it the notes in reverse order, but on the regular melody?
@BatElite Pretty much. The game has a list of values that it uses to play each note, ordered in ascending order (C, C#, D, D#, E...). We reversed those values, so they go in descending order (C, B, A#, A, G#...), but left the actual music data untouched, so it uses the wrong values.