Forbidden Planet. My god, that track is OUT THERE. I have no idea how Warner let them get away with it, but I'm damn glad they did. It isn't music, but echoes, zips, boings, wet slaps, etc. It's far out.
Eraserhead- again, "music" is far and in-between, and when there is actually a discernable tune it's often diegetic. The rest is just shit Lynch threw together in a sound studio over a long period of time. The best example is the scene with the suckling dogs.
Also, of course, any Argento/Goblin collaboration, most notably Suspiria, Deep Red and Tenebre.
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