Tritone: A musical interval of three whole tones, often perceived as dissonant. It spans six half steps and is known for its tension and instability.

Context and Significance

The tritone is a critical interval in music due to its distinct dissonant quality. It is commonly found in jazz, classical, and contemporary music to create tension and resolution. Frequently used in dominant seventh chords, it plays a crucial role in chord progressions and modulation. Instruments such as piano and guitar often employ the tritone to add complexity and emotional depth to compositions. Its dissonance makes it a powerful tool for composers seeking to evoke intrigue or unease.

Historical Background

The tritone’s history dates back to the medieval period, where it was dubbed “diabolus in musica” or “the devil in music” due to its unsettling sound. It was avoided in early Western music but later embraced by composers during the Baroque period. By the Romantic era, it became a staple for creating dramatic tension. In the 20th century, the tritone found prominence in jazz and popular music, showcasing its versatility and enduring appeal.

Examples

One of the most famous uses of the tritone is in the opening of Leonard Bernstein’s “West Side Story,” where the interval sets a tone of conflict. In classical music, Claude Debussy frequently utilized tritones to enhance harmonic color. The tritone is also evident in Black Sabbath’s “Black Sabbath,” where it contributes to the song’s ominous atmosphere. These examples highlight the tritone’s flexibility across genres and its capability to evoke strong emotional responses.

Related Terms

Dissonance: A combination of notes that clash, creating tension.

Perfect Fifth: An interval spanning seven half steps, often considered consonant.

Augmented Fourth: Another name for the tritone, emphasizing its role in altering harmony.

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