There's lots of ways to make music sound scary, but the most terrifying technique of all may be one you can't actually hear. Infrasound is sound waves that are too low for the human ear to perceive, instead creating a deep, rumbling sensation that unnerves you without seeming to come from anywhere, and it's becoming more and more common in horror movie scores. Low-level infrasound is all around us, all the time, but at high volumes we don't know a lot about its effects on the human body. The possibilities are fascinating, though, and they add a real-life scary edge to the phenomenon.

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