Root, third and seventh: the guide tones fix the quality, so the fifth is dropped. That is what leaves a string free, so pick a tension to put on top.
DmMaj9 is D, F, A, C# and E — DmMaj7 with the ninth added on top.
It sounds the same unease with more colour over it. The ninth softens the edge without resolving anything.

| D | F | A | C# | E |
|---|---|---|---|---|
| 1 | ♭3 | 5 | 7 | 9 |
Minor tonic — melodic minor, extended.
Also written DmM9, Dm(maj9) or D-Δ9. The same chord either way; which spelling you meet depends on who wrote the chart.
Root, third and seventh. The third and seventh, the guide tones, are what make the chord major, minor or dominant, so the fifth can go: it says nothing the symbol needs.
Three notes means a spare string, which is the real point. Put a tension on it.
DmMaj9 has 3 of them, on the middle four strings, the bottom four strings and the top four strings, from the 3rd fret up to the 10th — all in one inversion, so the bass note never moves. The one to learn first is the D shape at the 3rd fret.
Start with x53650 — no barre and 1 open string. 1 of the 8 shapes here sits in open position. 3 of the 8 need a barre. Together they cover the neck from the 3rd fret to the 14th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| x53650 | open position | D, root position | E | 1 open string |
| x70665 | 5th fret | E, 9th in the bass | A | 1 open string |
| 587655 | 5th fret | A, 2nd inversion | A | barred |
| x-8-0-9-10-9 | 8th fret | F, 1st inversion | C# | 1 open string |
| 10-8-x-9-10-9 | 8th fret | D, root position | C# | all fretted |
| 10-8-11-9-x-x | 8th fret | D, root position | E | all fretted |
| 10-12-11-10-10-12 | 10th fret | D, root position | E | barred |
| 12-12-12-14-14-13 | 12th fret | E, 9th in the bass | F | barred |
The same notes rebuilt from scratch give 7 drop 2, 5 drop 3, 13 rootless and 6 open string voicings, each on its own page.
Tensions. A shell of DmMaj9, root, third and seventh, leaves a string free, and the tones that belong over it are the 11 (G) and the 13 (B).
How you get to it. The turn that lands on DmMaj9 is Em7♭5 to A7♭9: the ii and the V of D minor, which is where a minor tonic is usually arrived at rather than simply begun on.
Every note of DmMaj9 is in D harmonic minor and D melodic minor.
Change one note of DmMaj9 and you have Dmaj9 (the minor third becomes a major third), Dm69 (the major seventh becomes a sixth), Dm9 (the major seventh becomes a flat seventh), DmMaj7 (drop the ninth), DmMaj11 (add the fourth) or Dmadd9 (drop the major seventh).
DmMaj9 is a minor chord — root, minor third, fifth. Minor chords on every root.
On DmMaj9’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.