I just came across this and fell in love with it. Large parts of the theme seem to be untouched (I'm a music noob, I guess just changing the key would do the trick?), but yet this version gives off a much darker, menacing vibe. Simple but effective. I could see it work in so many places (A ghosthouse underwater Level, A flodded castle, a haunted shipwreck, a more dramatic waterscrolling level, a polluted sea or even completely without water when encountering some ghosts just dancing to this unsetteling waltz)
Name: Super Mario World - Water (in F Harmonic Minor)
Type: The Original SMW underwater theme but in a different Key I suppose
Sampled: I guess not since it is basically the original theme
Youtube Link:
https://www.youtube.com/watch?v=Arhz1Ovl3h4