The most haunting music you ever heard?


I listened to the acoustic version of "Under the Milky Way" from the band "The Church". I can only describe it as haunting. Jokes aside, which might be too much to ask :-), what is the most haunting music/song or cd you have heard?
mike60
Morton Feldman's *Piano and String Quartet* with the Kronos String Quartet on Nonesuch (CD only).
... by Blind Willie Johnson, (which, incidentally, is one of the musical selections recorded onto the Voyager Golden Record).
"John Wayne Gacey, Jr." by Sufjan Stevens. When Sufjan sings "oh my God," if you don't get goose bumps, your dead. No pun intended.
Also Jeff Buckley singing "Mojo Pin."