In
music, an
altered chord, an example of alteration (
see below), is a
chord with one or more
diatonic notes replaced by, or altered to, a neighboring pitch in the
chromatic scale. For example, the
chord progression on the left uses four unaltered chords:
The progression on the right uses an altered IV chord and is an alteration of the previous progression. The A in the altered chord serves as a
leading tone to G, which is the
root of the next chord.