Piano wasn't as bad as people were making it out to be, I found revisiting the basement the real annoyance as I didn't immediately think of using the piano again.
HINT: There is a 6 key combination that you have to play on the piano that isn't on the piano note. You'll have to use a "previous" note to figure it out(Really simple single digits). Once you have this new key, you'll know where to go.