In Nancy drew message in a haunted mansion how do you unlock the piano?

You need to do these steps to unlock the piano; 1. Chip wall paper off of roof. 2. Find the two keys. 3. Read the two books on the piano in the library. 4. Unlock the ceiling door and the table inside of the attic. 5. Using what you've read in the books, write down the notes that have dark circles behind them. 6. Play these notes on the piano. For further help with this, go to www.uhs-hints.com