Aleister Crowley in ceremonial garb, 1912, via Wikimedia Commons

We’ve all had our wits scared out of us by films, images, and the written word, but somehow few forms work their haunting magic quite so effectively as sound alone. Think of the snap of the twig in the woods or the creak of the staircase in the empty house — or, to take it farther, the sound of possessed children speaking in tongues. You can hear recordings of that and other unusual phenomena at Ubuweb, which hosts the collection Occult Voices – Paranormal Music, Recordings of Unseen Intelligences 1905-2007.