Augmented seventh chord

The augmented seventh chord, or seventh augmented fifth chord,[1] or seventh sharp five chord is a seventh chord composed of a root, major third, augmented fifth, and minor seventh (1, 3, ♯5, ♭7).[2] It can be viewed as an augmented triad with a minor seventh.[3] When using popular-music symbols, it is denoted by +7, aug7,[2] or 7♯5. For example, the augmented seventh chord built on C, written as C+7, has pitches C–E–G♯–B♭:

augmented seventh chord
Component intervals from root
minor seventh
augmented fifth
major third
root
Tuning
80:100:125:144
Forte no. / Complement
4-24 / 8-24

The chord can be represented by the integer notation {0, 4, 8, 10}.

Use

The root is the only optional note in an augmented seventh chord, the fifth being required because it is raised.[4] This alteration is useful in the major mode because the raised 5th creates a leading tone to the 3rd of the tonic triad.[3] See also dominant.

In rock parlance, the term augmented seventh chord is sometimes confusingly and erroneously used to refer to the so-called "Hendrix chord", a 7♯9 chord which contains the interval of an augmented ninth but not an augmented fifth.[5]

One chord-scale option for an augmented dominant seventh chord (+7th) is the whole tone scale.[6]

The augmented minor seventh chord may be considered an altered dominant seventh and may use the whole tone scale, as may the dominant seventh flat five chord.[7] See chord scale system.

The augmented seventh chord normally resolves to the chord a perfect fifth below.[8] Thus, Gaug7 resolves to a C major chord, for example.

Augmented seventh chord table
Chord Root Major third Augmented fifth Minor seventh
Caug7 C E G♯ B♭
C♯aug7 C♯ E♯ (F) G (A) B
D♭aug7 D♭ F A C♭ (B)
Daug7 D F♯ A♯ C
D♯aug7 D♯ F (G) A (B) C♯
E♭aug7 E♭ G B D♭
Eaug7 E G♯ B♯ (C) D
Faug7 F A C♯ E♭
F♯aug7 F♯ A♯ C (D) E
G♭aug7 G♭ B♭ D F♭ (E)
Gaug7 G B D♯ F
G♯aug7 G♯ B♯ (C) D (E) F♯
A♭aug7 A♭ C E G♭
Aaug7 A C♯ E♯ (F) G
A♯aug7 A♯ C (D) E (F♯) G♯
B♭aug7 B♭ D F♯ A♭
Baug7 B D♯ F (G) A

See also

Sources
  1. Kroepel, Bob (1993). Mel Bay Creative Keyboard's Deluxe Encyclopedia of Piano Chords: A Complete Study of Chords and How to Use Them, p.15. ISBN 0-87166-579-4.
  2. Garner, Robert (2007). Mel Bay presents Essential Music Theory for Electric Bass, p.69. ISBN 0-7866-7736-8.
  3. "The Dominant with a Raised 5th", Kostka, Stefan, and Dorothy Payne. 2004. Tonal Harmony with an Introduction to Twentieth-Century Music. 6th Ed. pp. 446-447. New York. ISBN 978-0-07-332713-6.
  4. Latarski, Don (1991). An Introduction to Chord Theory, p.29. ISBN 0-7692-0955-6.
  5. Radio: "Shiver down the backbone – Jimi Hendrix comes to Radio 3", The Spectator, by Kate Chisholm, Wednesday, 21 November 2007
  6. Hatfield, Ken (2005). Jazz and the Classical Guitar Theory and Applications, p.121. ISBN 0-7866-7236-6.
  7. Berle, Annie (1996). Contemporary Theory And Harmony, p.100. ISBN 0-8256-1499-6.
  8. Bay, William (1994). Mel Bay Complete Jazz Sax Book, p.64. ISBN 0-7866-0229-5.
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