The Kell's Fall organ puzzle is one of the more mysterious parts of Destiny 2's new exotic mission. You discover this elaborate piano not long after entering the Kell's fortress, but you won't be able to enter any melodies until you finish the mission and grab the Slayer's Fang exotic. Once that's done, you'll be able to use this organ to unlock the Nightsworn Sight intrinsic upgrades and some fun easter eggs.
You can enter these on either normal or expert difficulty. Usually, you'd find the codes in the mission itself, but here I'll list each out, plus what it does. Since the organ has thirteen symbols to shoot to input each code, I'll list them here as 1-13 going left to right. To enter a code, you need to stand on the circular plate in front of the organ, then step off to activate the code you've entered. All that said, here's every Kell's Fall organ melody.
