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440Hz by Christopher Froehlich

440Hz from Christopher Fröhlich on Vimeo.

On one side the frequency rises from 392Hz to 466Hz, on the other side conversely. You can also hear the beat-frequency changing. (Through the alpha-, beta- and gammawaves. the brainwaves) The standard-pitch (440Hz) changed the last 250 years from 392Hz (France) and 466Hz (Italy) to nearly 440Hz (London 1938)