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In music theory, a diminished major seventh chord is a seventh chord composed of a diminished triad and a major seventh. 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 C, 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}.

Diminished major seventh chord table

Chord	Root	Minor third	Diminished fifth	Major seventh
C	C	E♭	G♭	B
C♯	C♯	E	G	B♯ (C)
D♭	D♭	F♭ (E)	A (G)	C
D	D	F	A♭	C♯
D♯	D♯	F♯	A	C (D)
E♭	E♭	G♭	B (A)	D
E	E	G	B♭	D♯
F	F	A♭	C♭ (B)	E
F♯	F♯	A	C	E♯ (F)
G♭	G♭	B (A)	D (C)	F
G	G	B♭	D♭	F♯
G♯	G♯	B	D	F (G)
A♭	A♭	C♭ (B)	E (D)	G
A	A	C	E♭	G♯
A♯	A♯	C♯	E	G (A)
B♭	B♭	D♭	F♭ (E)	A
B	B	D	F	A♯

References

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

v t e Chords
By form	Triad Major Minor Augmented Diminished Suspended Seventh Leading-tone Major Minor Dominant Dominant seventh flat five Diminished Half-diminished Diminished major Minor-major Augmented major Augmented minor Altered seventh Nondominant Harmonic seventh Extended Ninth Eleventh Thirteenth Upper structure Dominant 7♯9 Polychord Tone cluster Added / omitted Sixth Augmented sixth Lydian Seven six Specific Alpha Bridge Complexe sonore Dream Elektra Farben Grandmother Magic Mystic Northern lights Petrushka Psalms So What Tristan Viennese trichord General Mixed interval Secundal Tertian Quartal Synthetic chord Tetrad
By function	Diatonic Tonic Supertonic Mediant Subdominant Dominant Submediant Leading tone / Subtonic Altered Approach Borrowed Chromatic mediant Neapolitan Passing Secondary Secondary dominant Secondary leading-tone Secondary supertonic Other Common Contrast Primary triad Subsidiary Substitute
Techniques	Barre Block Chordioid Chord-scale system Guitar Open Power Slash
Other	Arpeggio Chord names and symbols List of chords Factor

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