I tried everything with the piano. I took notes, I used wordpad to decode the note, but nothing happened. My note read R20, R5, L3, R11, L26, L19; 2, 3, 6, 1, 4, 5. This comes out to R11, R20, R5, L26, L19, L3. I tried counting the keys out (11 keys from the right should be #42 right?). Not going to knock you for a clever puzzle, but it can be hard on the eyes.
If anyone knows what I'm doing wrong, please PM me.