Quora: What is the most hauntingly beautiful song?

Quora users respond to the question, "What is the most hauntingly beautiful song?" (with lots of YouTube links for listening)

I've been haunted by Kate and Janelle's cover of Neko Case's "Star Witness" since it first saw and heard it about a month ago. I made an mp3 of it with this useful tool so I could listen to it in the car, but I know seeing them perform it has colored all my listens since, the way they look and smile at each other, check in with each other, and the way Janelle (on the right) looks off into the ceiling:



I think part of what haunts me is that I'm afraid they won't sing together forever.

Another I might choose--one that I've been listening to a lot longer--is Meredith Monk's "Gotham Lullaby":




Several folks on Quora chose Samuel Barber's "Adagio for Strings", which is so devastatingly beautiful I always want to bawl about 30 seconds in. But "devastating" and "haunting" are different for me, thankfully...if this came haunting me I don't think I could stand up in the morning:



How would you answer the Quora question?