This puzzle can only be solved using the item unlocked from the Mirrors puzzle. The King has to repair an instrument using that item in order to play a melody of a few notes. His goal is then to reach a specific room containing some other instruments which can only reproduce single musical notes. Finally, he has to play that exact melody by interacting with those instruments in the right order and by remembering the original melody. Doing so will unlock a new, more powerful skill.
This puzzle can only be solved using the item unlocked from the Mirrors puzzle. The King has to repair an instrument using that item in order to play a melody of a few notes. His goal is then to reach a specific room containing some other instruments which can only reproduce single musical notes. Finally, he has to play that exact melody by interacting with those instruments in the right order and by remembering the original melody. Doing so will unlock a new, more powerful skill.