In music theory, a diminished major seventh chord is a seventh chord composed of a diminished triad and a major seventh.Jamini, Deborah. (2005). Harmony And Composition: Basics to Intermediate, p.204. . Thus, it is composed of a root note, together with a minor third, a diminished fifth, and a major seventh above the root: (1, 3, 5, 7). For example, the diminished major seventh chord built on C, commonly written as CoM7, has pitches C–E–G–B:
Diminished major seventh chords are very dissonant, containing the dissonant intervals of the tritone and the major seventh. They are 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.
The chord can be represented by the integer notation {0, 3, 6, 11}.
In other equal temperaments (edos) edom3d5M717edo481619edo5101722edo5102126edo7142327edo6122629edo7142731edo8162841edo10203853edo132649
Diminished major seventh chord table {| class="wikitable" !Chord !Root !Minor third !Diminished fifth !Major seventh |- !align=center|CM7 |align=center|C |align=center|E |align=center|G |align=center|B |- !align=center|CM7 |align=center|C |align=center|E |align=center|G |align=center|B (C) |- !align=center|DM7 |align=center|D |align=center|F (E) |align=center|A (G) |align=center|C |- !align=center|DM7 |align=center|D |align=center|F |align=center|A |align=center|C |- !align=center|DM7 |align=center|D |align=center|F |align=center|A |align=center|C (D) |- !align=center|EM7 |align=center|E |align=center|G |align=center|B (A) |align=center|D |- !align=center|EM7 |align=center|E |align=center|G |align=center|B |align=center|D |- !align=center|FM7 |align=center|F |align=center|A |align=center|C (B) |align=center|E |- !align=center|FM7 |align=center|F |align=center|A |align=center|C |align=center|E (F) |- !align=center|GM7 |align=center|G |align=center|B (A) |align=center|D (C) |align=center|F |- !align=center|GM7 |align=center|G |align=center|B |align=center|D |align=center|F |- !align=center|GM7 |align=center|G |align=center|B |align=center|D |align=center|F (G) |- !align=center|AM7 |align=center|A |align=center|C (B) |align=center|E (D) |align=center|G |- !align=center|AM7 |align=center|A |align=center|C |align=center|E |align=center|G |- !align=center|AM7 |align=center|A |align=center|C |align=center|E |align=center|G (A) |- !align=center|BM7 |align=center|B |align=center|D |align=center|F (E) |align=center|A |- !align=center|BM7 |align=center|B |align=center|D |align=center|F |align=center|A
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