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:
| Component intervals from root | |
|---|---|
| major seventh | |
| diminished fifth (tritone) | |
| minor third | |
| root | |
| Tuning | |
| 200:240:288:375 | |
| Forte no. / | |
| 4-18 / |
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[citation needed], 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 edit
Chord Root Minor third Diminished fifth Major seventh CoM7 C E♭ G♭ B C♯oM7 C♯ E G B♯ (C) D♭oM7 D♭ F♭ (E) A 
(G)
C DoM7 D F A♭ C♯ D♯oM7 D♯ F♯ A C 
(D)
E♭oM7 E♭ G♭ B (A)
D EoM7 E G B♭ D♯ FoM7 F A♭ C♭ (B) E F♯oM7 F♯ A C E♯ (F) G♭oM7 G♭ B (A)
D (C)
F GoM7 G B♭ D♭ F♯ G♯oM7 G♯ B D F (G)
A♭oM7 A♭ C♭ (B) E (D)
G AoM7 A C E♭ G♯ A♯oM7 A♯ C♯ E G (A)
B♭oM7 B♭ D♭ F♭ (E) A BoM7 B D F A♯
References edit
- ^ Jamini, Deborah. (2005). Harmony And Composition: Basics to Intermediate, p.204. ISBN 978-1-4120-3333-6.
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