The Royaltones

A Shepard tone is an auditory illusion created by overlapping sine waves separated by octaves, named after psychologist Roger Shepard. This phenomenon produces a continuous perception of ascending or descending pitch that ultimately returns to the original note, popularized in music and sound design through various applications in film and video games. Notably, variations like the Shepard–Risset glissando enable the illusion of smooth pitch changes, while the tritone paradox highlights listeners' varied perceptions of pitch based on cultural context. The Shepard tone's effects have been utilized in works by composers such as Karlheinz Stockhausen, and films like "Dunkirk" and "The Dark Knight."

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