Diminished major seventh chord

In music theory, a diminished major seventh chord is a chord composed of a diminished triad and a major seventh. Thus it is composed of a root, minor third, diminished fifth (tritone) and major seventh. It is very dissonant, containing the dissonant intervals of the tritone and the major seventh. It is frequently encountered, especially in jazz, as a diminished seventh chord with an appoggiatura, especially when the melody has the leading note of the given chord: the ability to resolve this dissonance smoothly to a diatonic triad with the same root allows it to be used as a temporary tension before tonic resolution. It is nevertheless infrequently used as a chord in itself.

The chord can be represented by the integer notation {0, 3, 6, 11}.