The first thing that spring to mind for me is "He Loved Him Madly", from Mile's "Get Up With It" record. 32 minutes of infinite sadness, creeps me out every time I hear it. Xenakis, "Kraanerg". Years ago I loaned this to Eyvind Kang, who said it was to scary for him to listen to all the way through. Considering Eyvind's tastes, that says a lot. Diamanda Galas, Plague Mass. Seeing this live was profoundly disturbing and cathartic. I can't listen to the disc anymore. I know it's pretty obvious, but lots of sci-fi/horror film scores can be pretty effective divorced from the films. Howard Shore's work is generally pretty great, his score to Cronenberg's "Scanners" remains a favorite. Even his work on lesser films like "The Cell" is great, though I really didn't like his John Williams-Wannabe score to "Lord of the Rings". "Forbidden Planet" (Bebe and Louis Barron) and parts of "The Day the Earth Stood Still" (Bernard Hermann). I've been meaning to pick up the scores to Tarkovsky's "Solaris" and "Stalker", in the films they are great. Speaking of Stalker, the Robert Rich/Lustmord disc of the same name is great. "Bestiary", also by Rich, is fantastic, and could be used as a textbook for creative modular synthesizer patching.