I'm at this place where she says something about a door and looking around the waters to open the door.
I've played the four notes I've found in the bottom-right of the map at every place I can imagine there, I've interacted with the door-look alike at the bottom-right of the map. I've found the thing in the top-right corner of the map. I'm probably missing out on something blatantly obvious, but I need help anyways, preferable something subtle.