Ok, I found the music note. It did not make music :( It did make the cat happy, but I think the expected progression may have been double jump-->flight instead of double jump-->triple jump-->flight like happened with me ^^; because if you have triple jump the only place in the game the music note works it's actually harder to use than just triple jumping up to the ledge, and you're gonna need moon walking either way. Personally, though, I feel like triple jump is way more guessable than music note, but oh well.