Stone Age Soundtracks: The Acoustic Archaeology of Ancient Sites

by Paul Devereux
"Inayat Khan went on to point out that drumming can cause ecstasy in people "because the sound of the drum goes directly into their whole system, bringing it to a certain pitch". Not technical language, perhaps, but an accurate account of what happens; he says it quite clearly -- is is pitch that does the job, and pitch is frequency. He referred to a feast in the Indian calendar when people are driven by drumming into an altered state called hal in which they are able to step into fires without being burned, or to cut themselves with blades and heal instantly."

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