You should check out a record called "Okkulte Stimmen - Mediale Musik"
which is recordings of exorcisms and similar stuff, seriously creepy. Search for it on google blogs.
I bought a record by a italian 70/80s band called Jacula once which was recorded during a satanic mass, but the music sucked.
Also I support the mention of Tibetan music, some of it is really dark and weird. Maybe try some throat singing? Maybe some of the old nonesuch recordings?
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