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]

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

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

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Jazz

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".[3] – 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.

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