the wierd thing is, the OST version of the song plays only in the Japanese version of the game, I don't know why they made two versions of the same song, I don't know which one I like more since its so fun to listen to,
I know this is a comment from years ago, but I suspect the guitar bit was glitched (wrong pitch) in the Japanese version, and they corrected it for the international release(s).
It's OK, this comment was from a account I don't have access to anymore. The Guitar part in the Japanese version doesn't sound like a Guitar to me. I kinda prefer it and the droplet noise over the Guitar and the Metal clink in the International version. same goes for the japanese version of Bowser's Castle in this game.