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. Jazz In jazz and jazz harmony, the term altered chord refers to a dominant chord "in which neither the fifth nor the ninth appears unaltered" and which thus "contains b5 &/or #5, and b9 &/or #9".[2] – in other words, where the 5th and the 9th are raised or lowered by a single semi-tone, or omitted. This chord is notated as an "alt chord" (e.g. G7alt Play (help•info)). Altered chords are thus constructed using the following notes, some of which may be omitted: • root • 3 • b5 and/or #5 • b7 • b9 and/or #9 The chord may thus include both a flatted and sharped form of the altered fifth or ninth, e.g. G7b5#5b9; however, it is more common to use only one such alteration per tone, e.g. G7b5b9, G7b5#9, G7#5b9, or G7#5#9. The choice of inversion, or the omission of certain tones...
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