Shepard Tones
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Shepard tones are sounds named after Roger Shepard. Going clockwise, each tone sounds higher than all tones preceding it and lower than all tones following it. Even though there are only twelve tones, each tone sounds both higher and lower than every other when played in a continuous loop.
Contributed by: Theodore Gray (March 2011)
Open content licensed under CC BY-NC-SA
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"Shepard Tones"
http://demonstrations.wolfram.com/ShepardTones/
Wolfram Demonstrations Project
Published: March 7 2011