In Nancy Drew: Sea of Darkness, Nancy finds a music box, but needs the right sheet of music to know how to place the “tines” (bars) in the correct order. She gets the sheet of music from Elisabet, after she confronts her about Tumi and talks about the song she sang.
Using the blue music book found on the coffee table in the pub entrance, you can match the notes on the sheet to the tine notes. For example, in the blue music book it shows the “g” note is the lowest and the tine with the lowest cut which has about 10 lines across it. This is the first tine that need to be placed in order.
Or you can simply watch the video to match the heights of the tine cuts.
Tip: you can play around with the tines and then check your work by pulling the crank to play the cylinder and cue the music.