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Altered chord

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In music, an altered chord, an example of alteration, is a chord with one or more diatonic notes replaced by, or altered to, a neighboring pitch in the chromatic scale. For example the following progression uses four unaltered chords:[1]

Unaltered chord progression

The next progression uses an altered IV chord and is an alteration of the previous progression[1]:

Altered chord progression

The A in the altered chord serves as a leading tone to G, which is the root of the next chord.

Jazz

G7alt chord. About this sound Play G7alt
Altered chord on C with flat 5th, 7th, and 9th. About this sound Play

In jazz and jazz harmony, the term altered chord, notated as an alt chord (e.g. G7alt About this sound Play ), refers to a dominant chord, "in which neither the fifth nor the ninth appears unaltered".[2] – namely, where the 5th and the 9th are raised or lowered by a single semitone, or omitted. Altered chords are thus constructed using the following notes, some of which may be omitted:

  • root
  • 3
  • 5 and/or 5
  • 7
  • 9 and/or 9

Altered chords may include both a flatted and sharped form of the altered fifth or ninth, e.g. G7559; however, it is more common to use only one such alteration per tone, e.g. G759, G759, G759, or G759.

The choice of inversion, or the omission of certain tones within the chord (e.g. omitting the root, common in guitar harmony), can lead to many different possible colorings, substitutions, and enharmonic equivalents. Altered chords are ambiguous harmonically, and may play a variety of roles, depending on such factors as voicing, modulation, and voice leading.

The altered chord's harmony is built off the altered scale, which includes all the alterations shown in the chord elements above:

  • root
  • 9 (=2)
  • 9 (=2 or 3)
  • 3
  • 11 (=4 or 5)
  • 13 (=5)
  • 7
D711 chord = G7alt chord About this sound Play

Altered chords can be analyzed as a kind of tritone substitution (5 substitution). Thus the alt chord on a given root is the same as the 711 chord on the root a tritone away (e.g., G7alt is the same as D711 About this sound Play ).

Tritone substitution and altered chord as, "nearly identical"[3] About this sound Play .

Altered chords are commonly substituted for regular dominant V chords in ii-V-I progressions, most commonly in minor harmony leading to an i7 (tonic minor 7th) chord.

More generally in jazz, the terms altered chord and altered tone also refer to the family of chords that involve 9 and 5 voicing, as well as to certain other chords with related ambiguous harmony. Thus the "79 chord" (e.g. G79) is used in the context of a dominant resolution to a major tonic, which is typically voiced with a 13 rather than the 13 of the alt chord. When voiced with a 13, jazz musicians typically play the half-step/whole-step diminished scale over the 9 chord (e.g. G, A, B, B, C, D, E, F over G79).

Note that in chord substitution and comping, a 79 is often used to replace a diminished chord, for which it may be the more "correct" substitution due to its incorporation of an appropriate root tone. Thus, in a progression where a diminished chord is written in place of a G7 chord, i.e. where the dominant chord is replaced by an A-dim (A-C-Edouble flat = G-B-D), D-dim (D-F-A), B-dim (B-D-F), or F-dim (F-A-C = F-G-B)), a G79 is often played instead. G79 (G-B-D-F-A) contains the same notes as any of these diminished chords with an added G root.

See also

Sources

  1. ^ a b Erickson, Robert (1957). The Structure of Music: A Listener's Guide, p.86. New York: Noonday Press. ISBN 083718519X (1977 edition).
  2. ^ Sher (ed.). The New Real Book Volume Two. Sher Music Co., 1991, ISBN 0-9614701-7-8
  3. ^ Coker, Jerry (1997). Elements of the Jazz Language for the Developing Improvisor, p.81. ISBN 157623875X.


This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Altered chord". Allthough most Wikipedia articles provide accurate information accuracy can not be guaranteed.


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