Rowan, did you get the score for that harp playing, from Maren, in a previous quest, according to The gamepressure walkthrough? I remember playing music in 2 worlds 2, (not the pirates)to open a door, and it had nothing to do with playing music, just using the few keys indicated and Oh! surprise, the door opened! But push any button, it does not work without the music sheet.
My question is a stupid question, forget it if you had everything you needed.