The most haunting music you ever heard?

Two more for the mix

Danse Macabre - Camille Saint Saens
A Night on Bald Mountain - Modest Mussorgsky/ Rimsky-Korsakov

Pet Cemetery - Soundtrack
Crimson Glory - 'Lost Reflection'

Thanks to the above posters for helping, I'll keep searching.

Bob Dylan
His albums produced by Daniel Lanois, Oh Mercy and Time Out of Mind are both haunting and beautiful in his very special way. Try the track Man In The Long Black Coat and you will stop doing anything else!

to get slightly off track, my issue with daniel lanois is that he makes everyone sound exactly the same--whether it's dylan, emmylou harris, peter gabriel (hell, he even produced raffi), their records all have that hazy, gauzey sound that's sorta depressing.
i feel much better having vented and can now return to work. sorry to digress.