The most haunting music you ever heard?

"Careful with that ax Eugene" - Pink Floyd (Ummagumma)

"Grey Walls" - Richard Thompson (Rumor and Sigh)

Brian Eno-Another Green World, Fourth World, "Energy Fools the Magician" from Before and After Science
Robert Fripp/Brian Eno - "Wind on Water" and "Wind on Wind"
T. Rypdal - Decendre
Jade Warrior - Kites
Ralph Towner - Rumours of Rain - Blue Sun
John Abercrombie - Timeless
Pat Metheny - certain pieces on New Chautauqua
Vangelis - China
Vangelis - Beaumborg
Weather Report - Mysterious Traveler, "Badia" from Tale Spinnin
Alan Parsons - "Fall of the House of Usher" "To One in Paradise" from Tales of Mystery and Imagination
John Lennon singing "Julia" on the White Album,
other Beatles tunes, come to think of it:
Tomorrow Never Knows - Revolver
Blue Jay Way - Magical Mystery Tour
Long, Long, Long - White Album
For Benefit of Mr. Kite - Sgt. Pepper
how about Moody Blues "Dear Diary" "Have you Heard/the Voyage"
Genesis - "Silent Sorrow in Empty Boats" on Lamb Lies Down on Broadway
Camel - Intro to "Lumar Sea" on Moonmadness
Ravel - Mother Goose Suite

Dawn Upshaw, Sergio & Odair Assad Orpheus Chamber Orchestra, "Il la Luna Esta Muerta" on White Moon - Songs to Morpheus

John Williams and Yo Yo Ma, "The Invasion" on Seven Years in Tibet (Original Motion Picture Soundtrack)

Branford Marsalis Quartet "Eternal" on Eternal

Rickie Lee Jones "Comin' Back to Me" on Pop Pop

Jack Johnson "Belle" on In Between Dreams

amethystium, dead can dance, delerium and loreena mckennit.
all masters of their very fine craft.

Alison Krauss' "Jacobs Dream" off the CD "A Hundred Miles or More" should be added to the list. Haunting and heart wrenching.