Aphex Twin - Selected Ambient Works 85-92 worked well for me during one late-night Cthulhu game.
Some Speedy J tracks might also fit the bill nicely.
ETA: Aphex Twin did an album under the name Polygon Window, the album was called Surfing on Sine Waves. A whole album of pretty disturbing beats. Like this
[ame]http://www.youtube.com/watch?v=g9Zrw7qXVac&feature=related[/ame]
Some Speedy J tracks might also fit the bill nicely.
ETA: Aphex Twin did an album under the name Polygon Window, the album was called Surfing on Sine Waves. A whole album of pretty disturbing beats. Like this
[ame]http://www.youtube.com/watch?v=g9Zrw7qXVac&feature=related[/ame]
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