Music Disc 12 for the deep dark

we already have 11 and 13 but we don’t have 12. weird right? so it only makes sense it would be hidden in the deepest scariest place in all of minecraft, the deep dark. it would finally answer who the person who recorded both disc was and we could find their remains and makeshift camps all around the deep dark where we have to solve a puzzle by finding three keys to open the portal in the center to take us further thats my idea.