| Chord Name: | diminished major seventh |
| First Interval: | root |
| Second Interval: | minor third |
| Third Interval: | diminished fifth (tritone) |
| Fourth Interval: | major seventh |
| Forte Number: | 4-18 |
| Complement: | 8-18 |
| Tuning: | 200:240:288:375 |
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 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 .
| Chord | Root | Minor third | Diminished fifth | Major seventh | |
|---|---|---|---|---|---|
| CM7 | C | E | G | B | |
| CM7 | C | E | G | B (C) | |
| DM7 | D | F (E) | A (G) | C | |
| DM7 | D | F | A | C | |
| DM7 | D | F | A | C (D) | |
| EM7 | E | G | B (A) | D | |
| EM7 | E | G | B | D | |
| FM7 | F | A | C (B) | E | |
| FM7 | F | A | C | E (F) | |
| GM7 | G | B (A) | D (C) | F | |
| GM7 | G | B | D | F | |
| GM7 | G | B | D | F (G) | |
| AM7 | A | C (B) | E (D) | G | |
| AM7 | A | C | E | G | |
| AM7 | A | C | E | G (A) | |
| BM7 | B | D | F (E) | A | |
| BM7 | B | D | F | A |