I beated the game, the piano part is not easy but is not that difficul =3
the numbers 1,2,3,4,5 and 6 are the order, for example: 2,3,1,6,5,4 that is the order in which you're going to play the keys
for example:
R23 R5 L23
L26 L9 R10
R23 would be the second one IF the order was like this: 2,3,1,6,5,4.
L23 would be the third one, etc. etc.
L means left, R means right
which means that you have to start from the left or right, example: R23= count 23 keys from right to left.
ALSO! IF someone can pm me or something about how to get to the basement I would appreciate it, I cannot seem to solve the second puzzle NOR how to open the cabinets in the room with the "Letter" from Rose to Kane