The Shepard Tone creates the illusion of a sound that rises or falls forever without ever reaching its destination.
The Shepard Tone is one of the most fascinating auditory illusions in music and sound design. Used in films, video games, electronic music and sound design, it creates tension, anticipation and unease by tricking the listener into hearing a pitch that appears to move endlessly.
Named after cognitive scientist Roger Shepard, the effect is based on the same principles used in visual illusions that appear to move forever. Since the 1960s, the concept has been adapted into music, sound design and even rhythm through the closely related Risset Rhythm.
The illusion works particularly well because listeners naturally expect the sound to eventually resolve, but it never does.
How Does a Shepard Tone Work?
The Shepard Tone works by combining multiple versions of the same note or scale across different octaves.
As the notes rise, the highest layer gradually fades out while a new lower layer fades in underneath. If the illusion is descending, the opposite happens. Because this process repeats continuously, the listener never hears a true beginning or ending point.
The result is an endlessly ascending or descending pitch illusion.
A simple way to think about it is:
- Create multiple tones separated by octaves
- Move all tones upward or downward together
- Fade out the highest or lowest layer
- Fade in a new octave at the opposite end
- Repeat continuously
Although the illusion sounds complex, the underlying principle is surprisingly simple once visualised.
Shepard Tone Examples in Music and Sound Design
The Shepard Tone has been used successfully in film soundtracks, game audio and music production for decades. The following examples demonstrate how composers and sound designers have used the illusion to create tension, suspense and a sense of constant motion.
Super Mario 64 - Endless Stairs
The soundtrack to the Endless Stairs section in Super Mario 64 makes excellent use of the Shepard Tone. A repeating musical phrase creates the illusion that the notes are continuously ascending, perfectly supporting the impossible staircase concept.
Hans Zimmer's Use of Shepard Tones
Few composers have used the Shepard Tone as effectively as Hans Zimmer. His use of the effect often creates intense suspense, anxiety and a feeling that events are constantly accelerating.
Dunkirk
In Dunkirk, Zimmer incorporates Shepard Tone techniques directly into the score. Combined with the famous ticking clock motif, the effect creates a relentless sense of rising tension throughout the film.
Batman: The Dark Knight
The Dark Knight uses Shepard Tone techniques in several places. One of the most famous examples is the Batpod sequence, where the illusion creates the impression that the motorcycle is accelerating endlessly.
The effect is also used before key scenes involving the Joker, subtly increasing tension and anticipation.
Once you become familiar with the effect, you'll start noticing it throughout film scores and sound design due to its incredible ability to create suspense and anticipation.
Examples of Shepard Tone in Music
Franz Ferdinand - Always Ascending
You can hear the Shepard Tone from the very start of the song. The rising effect perfectly complements the title and theme, creating the feeling that the music is constantly moving upwards.
The Beatles - I Am The Walrus
The effect appears towards the end of the song and works beautifully alongside the rising harmony and surreal lyrical content.
Godspeed You! Black Emperor - The Dead Flag Blues
Most examples focus on ascending Shepard Tones, but this track demonstrates a descending version using slide guitar techniques.
Around 7 minutes 40 seconds, the effect is used alongside train sounds, creating an unsettling sensation of constantly falling or descending.
Shepard Tone in Rhythm
The same concept has also been applied to rhythm.
Created by Jean-Claude Risset, the Risset Rhythm creates the illusion of a rhythm that continuously accelerates without ever reaching its maximum speed.
This effect is commonly used in experimental music, sound design and mathematical rhythm demonstrations.
The example below combines visual, rhythmic and pitch-based illusions simultaneously.
If you're interested in unusual rhythmic concepts, you may also enjoy our Polyrhythms and Polymeters Tutorial.
How to Create a Shepard Tone
There are several ways to create a Shepard Tone, but the underlying principle remains the same: continuously replace one octave with another while maintaining the illusion of constant movement.
Many producers create Shepard Tone risers using synthesizers, MIDI automation or layered audio samples.
Method 1: Multiple Oscillators
- Create three or more oscillators separated by octaves
- Pitch them upwards or downwards together
- Fade out the highest or lowest oscillator
- Fade in a new octave at the opposite end
- Repeat continuously
Method 2: MIDI and Automation
I personally find MIDI the easiest approach because it provides a clear visual representation of the illusion.
Using MIDI also allows the technique to work with:
- Monophonic synthesizers
- Polyphonic synthesizers
- Sampler instruments
- Audio recordings
- Orchestral libraries
This flexibility makes the Shepard Tone surprisingly useful in modern music production.
Will from EDM Tips demonstrates one method using pitch bend and multiple oscillators covering different octave ranges.
Oscar from Underdog demonstrates the Shepard Tone as a riser effect and also explores some interesting rhythmic applications.
Final Thoughts
The Shepard Tone remains one of the most powerful auditory illusions ever developed. Despite being introduced in the 1960s, it continues to appear throughout modern music, film soundtracks, video games and sound design.
Whether used subtly in a film score or as the centrepiece of an EDM riser, the illusion taps into our natural expectation that rising sounds should eventually reach a destination.
Of course, with a Shepard Tone, they never do.
For more unusual sound design concepts, explore our Sound Design Tutorials.
