Tritone

A tritone is a special sound in music. It is made by using three whole tones. This sound can feel very restless. It often sounds like it wants to move.

Some people think this sound is scary. Long ago, some thought it sounded like the devil. Because of this, singers sometimes avoided it. They wanted the music to sound calm.

Later, composers used it to tell stories. They used it to show dark places. It can make music feel very tense.

Today, many people use this sound. It can make a song feel exciting. It can even make music feel strange. Do you like sounds that surprise you?

A tritone is a special sound in music. It is made of three whole tones. It can be an augmented fourth or a diminished fifth.

This interval sounds very restless. In the past, many people found it quite harsh. Some called it "the devil in music." Because it sounded unstable, singers often avoided it. They wanted their music to stay calm.

Later, composers found new ways to use it. They used the sound to create tension. It can help music move from one key to another. Some used it to tell dark stories. For example, Franz Liszt used it to suggest Hell. Hector Berlioz used it to show a trip to a dark place.

In the 1900s, the tritone became a tool for many artists. Claude Debussy used it to show sudden power in his songs. Benjamin Britten used it to make music feel sad and unsure. Even today, composers use it to make music feel exciting or strange. It is a powerful part of how we hear sound.

A tritone is a very special musical interval. It is made of three whole tones. You can hear it when notes are spaced in a certain way. For example, the notes F and B make a tritone. This happens because you can count three whole steps between them. In some systems, it divides an octave exactly in half. This means it covers six semitones.

Music experts use two ways to define this sound. The narrow definition says a tritone is only an augmented fourth. An augmented fourth is a perfect fourth made one semitone wider. The broad definition is much larger. It includes augmented fourths and diminished fifths. A diminished fifth is a perfect fifth made one semitone narrower. It can even include very rare sounds like doubly augmented thirds.

History shows that people have had strong feelings about this sound. In the Middle Ages, many singers avoided it. It sounded very unstable and restless. Some people even called it "the devil in music." This name came from notes called "mi" and "fa" clashing together. While stories about people being punished for using it might be myths, the dislike was real. Many theorists wanted to avoid the F and B clash.

As time passed, composers learned to use the tritone for effect. They used it to create tension that needs to be released. In the Baroque and Classical periods, it became part of certain chords. For example, dominant seventh chords use a tritone. It helps the music move toward a resting point called the tonic. Later, Romantic composers used it to tell dark stories. Franz Liszt used it to suggest Hell in his Dante Sonata.

In the 20th century, the tritone became a neutral tool for many artists. Claude Debussy used it to show sudden, overwhelming power in his music. He used it in his cantata "La Damoiselle Elue." Benjamin Britten also used it in his "War Requiem." He used a tritone between C and F-sharp to create a sad feeling. Even in modern styles like twelve-tone music, the tritone is very important. It can help a composer move quickly between different keys.

A tritone is a specific musical interval that spans exactly three whole tones. In the system of 12-tone-equal temperament, this interval divides an octave exactly in half. An octave consists of 12 semitones, or 1200 cents, meaning a tritone covers 6 semitones or 600 cents.

Because of this symmetry, the tritone plays a special role in various musical structures. It is often described as a restless or unstable sound. This instability makes it a vital tool for composers looking to create tension or movement within a piece of music.

Music theorists use two different ways to define what counts as a tritone. Under a narrow definition, only the augmented fourth is considered a tritone. An augmented fourth is created by widening a perfect fourth by one semitone without changing the letter names. Under this narrow view, a diatonic scale like C major contains only one tritone, which is F–B. However, a broad definition is much more inclusive. This version includes augmented fourths and diminished fifths, which are created by narrowing a perfect fifth by one semitone.

This broader view means a diatonic scale actually contains two tritones per octave, such as F–B and B–F in C major. It can even include rare intervals like doubly augmented thirds or doubly diminished sixths.

The way a tritone functions depends heavily on the type of scale being used. In a major scale, the augmented fourth appears between the fourth and seventh scale degrees. In a natural minor scale, a diminished fifth occurs between the second and sixth degrees. Harmonic minor scales are more complex, containing both an augmented fourth and a diminished fifth. Melodic minor scales change depending on whether the melody is ascending or descending.

Scales that contain these intervals are called tritonic, while those without them are called atritonic.

In traditional functional harmony, the tritone is a primary source of dissonance. This dissonance creates a strong urge for the notes to move toward a resolution. For example, diminished triads and dominant seventh chords contain tritones that push toward the tonic, or the home key. Augmented sixth chords also use tritones spelled as augmented fourths. The Italian and German sixth chords each contain one augmented fourth. In contrast, the French sixth chord is built from two superposed augmented fourths that are a major second apart.

These chords often resolve by moving in contrary motion to create a sense of stability.

The history of the tritone is marked by a long period of avoidance. During the Middle Ages and the Renaissance, it was classed as a dissonance and often rejected. Medieval ecclesiastical singers frequently avoided the interval in religious music. Early theorists like Guido of Arezzo even suggested moving the hexachord system to avoid the F–B tritone. Some historical accounts even refer to the interval as "the devil in music."

While there are no known records of singers being punished by the Church for using it, the association with the devil became a lasting cultural idea. This nickname often referred to the clash between notes like "mi" and "fa" from adjacent hexachords.

As music moved into the Baroque and Classical periods, composers began to use the tritone in a controlled way. They utilized it within the tension-release mechanism of tonal music. By the Romantic period, composers used the interval more freely to exploit its expressive and dark connotations. Franz Liszt used the tritone to suggest the atmosphere of Hell in his Dante Sonata. Richard Wagner used timpani tuned to C and F to create a brooding feeling in the second act of his opera, Siegfried.

Hector Berlioz also used massive B and F chords to create a "tonal wrench" during a transition in his work, Faust.

In the 20th century, the tritone became a neutral structural tool rather than just a source of tension. Claude Debussy used the interval to convey sudden, overwhelming power in his cantata, "La Damoiselle Elue." In twelve-tone music and serialism, the tritone is often viewed as a neutral interval. It can play a major role in structural systems, such as the axis system used by Béla Bartók. Benjamin Britten also utilized the interval for emotional impact. In his "War Requiem," he used a tritone between C and F-sharp to create a somber and ambiguous atmosphere.

Even in popular music, the tritone remains influential, such as in Leonard Bernstein's "West Side Story."