Editing Shepard tone (section)

=== Perpetual melody ===
Pedro Patricio observed in 2012 that, by using a Shepard tone as a sound source and applying it to a melody, he could reproduce the illusion of a continuously ascending or descending movement characteristic of the Shepard Scale. Regardless of the tempo and the [[Envelope (music)|envelope]] of the notes, the auditory illusion is effectively maintained. The uncertainty of the scale the Shepard tones pertain allows composers to experiment with deceiving and disconcerting melodies.<ref>Patricio, Pedro. [https://www.researchgate.net/publication/279236493_From_the_Shepard_tone_to_the_perpetual_melody_auditory_illusion From the Shepard tone to the perpetual melody auditory illusion]. Proceedings of the 9th Sound and Music Computing Conference, SMC 2012. 5-10, 2012.</ref>[[File:Melodia Perpètua.wav|thumb|An example of an ascendent perpetual melody|left]]

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