The standard grips this chord is usually shown with.
CmMaj7 is C, Eb, G and B — Cm with the major seventh added on top.
It sounds tense and wrong-footed. A minor triad carrying a major seventh: the semitone under the root over a minor chord is the first bar of a line cliché.

| C | Eb | G | B |
|---|---|---|---|
| 1 | ♭3 | 5 | 7 |
Minor tonic — the tonic of the melodic minor.
Also written CmM7, Cm(maj7), C-Δ7 or CminMaj7. The same chord either way; which spelling you meet depends on who wrote the chart.
CmMaj7 in root position puts C in the bass, which is the chord as it is spelled: the note it is named after underneath everything else.
6 of CmMaj7’s 7 common shapes do this: x3100x, x35443, x-x-10-8-8-7, 8-10-9-8-8-8, x-x-10-12-12-11, x-15-13-12-12-x.
Start with x3100x — no barre and 2 open strings. 1 of the 7 shapes here sits in open position. 1 of the 7 needs a barre. Together they cover the neck from the 1st fret to the 15th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| x3100x | open position | C, root position | B | 2 open strings |
| x35443 | 3rd fret | C, root position | G | all fretted |
| x65587 | 5th fret | Eb, 1st inversion | B | all fretted |
| x-x-10-8-8-7 | 7th fret | C, root position | B | all fretted |
| 8-10-9-8-8-8 | 8th fret | C, root position | C | barred |
| x-x-10-12-12-11 | 10th fret | C, root position | Eb | all fretted |
| x-15-13-12-12-x | 12th fret | C, root position | B | all fretted |
The same notes rebuilt from scratch give 4 shell, 13 drop 2, 8 drop 3 and 3 open string voicings, each on its own page.
Tensions. A shell of CmMaj7, root, third and seventh, leaves a string free, and the tones that belong over it are the 9 (D), the 11 (F) and the 13 (A).
How you get to it. The turn that lands on CmMaj7 is Dm7♭5 to G7♭9: the ii and the V of C minor, which is where a minor tonic is usually arrived at rather than simply begun on.
Every note of CmMaj7 is in C harmonic minor and C melodic minor.
Change one note of CmMaj7 and you have Cm (drop the major seventh), Cmaj7 (the minor third becomes a major third), Cm6 (the major seventh becomes a sixth), Cm7 (the major seventh becomes a flat seventh), CmMaj7b5 (the fifth becomes a flat fifth) or CmMaj9 (add the ninth).
CmMaj7 is a minor chord — root, minor third, fifth. Minor chords on every root.
On CmMaj7’s sound and use this page follows Mark Levine, The Jazz Theory Book (Sher Music, 1995). The shapes and the derived voicings come from different places, and both are explained in where the chords and the theory come from.
Shows each chord the way this style would voice it, and marks which of its alternatives belong to the idiom.