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Extended harmony is a fundamental concept in modern music theory that enriches the sound of chords by adding tones beyond the basic triad. Among these extended chords, the thirteenth chord stands out for its complexity and expressive potential. Understanding this chord can significantly enhance a musician’s harmonic vocabulary and improvisational skills.
What Is a Thirteenth Chord?
A thirteenth chord is a type of extended chord that includes the root, third, fifth, seventh, ninth, eleventh, and thirteenth degrees of a scale. It is essentially a dominant seventh chord with six additional tones, creating a rich, layered sound. The thirteenth is the furthest extension commonly used in jazz and contemporary music, providing a sense of depth and complexity.
Construction of a Thirteenth Chord
The basic structure of a thirteenth chord is built by stacking thirds on top of a dominant seventh chord. For example, a C13 chord includes the following notes:
- C (root)
- E (major third)
- G (perfect fifth)
- Bâ™ (minor seventh)
- D (ninth)
- F (eleventh)
- A (thirteenth)
In practice, not all notes are played simultaneously. Often, musicians omit some tones, especially the fifth or the eleventh, to avoid muddiness and to simplify the voicing.
Voicing and Usage
Voicing a thirteenth chord involves selecting which notes to emphasize. Common approaches include:
- Playing the root, third, and thirteenth for a clear, open sound.
- Omitting the root if the bass provides it, as is common in jazz.
- Adding extensions like the ninth or eleventh for color.
Thirteenth chords are prevalent in jazz, funk, and fusion genres. They often function as dominant chords leading to a tonic or other harmonic destinations, creating tension and release.
Listening Examples
Some iconic songs feature the use of thirteenth chords, such as:
- “Giant Steps” by John Coltrane
- “Spain” by Chick Corea
- “Watermelon Man” by Herbie Hancock
Listening to these pieces can help identify the lush, sophisticated sound that thirteenth chords contribute to modern music.
Summary
The thirteenth chord is a versatile and expressive extension of the dominant seventh chord, adding richness and complexity to harmonic progressions. Mastering its construction and voicing can open new avenues for creativity in composition and improvisation.