Diminished major seventh chord

In music theory, a diminished major seventh chord is a seventh chord composed of a diminished triad and a major seventh.[1] 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
Component intervals from root
major seventh
diminished fifth (tritone)
minor third
Forte no. / Complement
4-18 / 8-18

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. It is nevertheless infrequently used as a chord in itself.

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

Diminished major seventh chord table

Chord Root Minor third Diminished fifth Major seventh
CoM7 C E G B
CoM7 C E G B (C)
DoM7 D F (E) A (G) C
DoM7 D F A C
DoM7 D F A C (D)
EoM7 E G B (A) D
EoM7 E G B D
FoM7 F A C (B) E
FoM7 F A C E (F)
GoM7 G B (A) D (C) F
GoM7 G B D F
GoM7 G B D F (G)
AoM7 A C (B) E (D) G
AoM7 A C E G
AoM7 A C E G (A)
BoM7 B D F (E) A
BoM7 B D F A


  1. Jamini, Deborah. (2005). Harmony And Composition: Basics to Intermediate, p.204. ISBN 978-1-4120-3333-6.
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