Augmented seventh chord
Component intervals from root | |
---|---|
minor seventh | |
augmented fifth | |
major third | |
root | |
Tuning | |
80:100:125:144 | |
Forte no. / | |
4-24 / |
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♭:
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]
![{
\override Score.TimeSignature #'stencil = ##f
\relative c' {
\clef treble
\time 6/4 c4^\markup { "C whole tone scale" } d e fis gis ais \time 4/4 c1 \bar "||"
\time 4/4 <c, e gis bes>1 \bar "||"
} }](http://upload.wikimedia.org/score/0/3/03zhi4kurgm7sr82smw0t0f0nhqrd26/03zhi4ku.png)
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
See also
Sources
- ^ 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.
- ^ a b Garner, Robert (2007). Mel Bay presents Essential Music Theory for Electric Bass, p.69. ISBN 0-7866-7736-8.
- ^ a b "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.
- ^ Latarski, Don (1991). An Introduction to Chord Theory, p.29. ISBN 0-7692-0955-6.
- ^ Radio: "Shiver down the backbone – Jimi Hendrix comes to Radio 3", The Spectator, by Kate Chisholm, Wednesday, 21 November 2007
- ^ Hatfield, Ken (2005). Jazz and the Classical Guitar Theory and Applications, p.121. ISBN 0-7866-7236-6.
- ^ Berle, Annie (1996). Contemporary Theory And Harmony, p.100. ISBN 0-8256-1499-6.
- ^ Bay, William (1994). Mel Bay Complete Jazz Sax Book, p.64. ISBN 0-7866-0229-5.