If you've made it to certain rooms in the house in Blue Prince you might have come across sheet music. These numbered pages when put together will spell out a message that will reveal one of the secret found rooms for the mansion.
The first thing you'll need to do is collect all of the pages.
Music Sheet Locations
Hint #1 - There are 8 pages in total and they can be found in four different rooms
Hint #2 - The rooms that pages can be found in are the Music Room, Green House, Ballroom, and Workshop
Hint #3 - The lyrics of each page will point to a second message hidden within

Music Sheet Solution
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Blue Prince