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.
Dm9 is D, F, A, C and E — Dm7 with the ninth stacked above it.
It sounds warm, and considerably richer than an m7. The standard voicing for a ii chord once the plain one has been played enough.

| D | F | A | C | E |
|---|---|---|---|---|
| 1 | ♭3 | 5 | ♭7 | 9 |
Pre-dominant or minor tonic — an m7’s job with more colour.
Also written Dmin9, D-9 or D minor 9. 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.
Dm9 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, which is the easiest grip here.
Start with 100210 — no barre and 3 open strings. 1 of the 9 shapes here sits in open position. 4 of the 9 need a barre. Together they cover the neck from the 1st fret to the 12th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| 100210 | open position | F, 1st inversion | E | 3 open strings |
| 132231 | 1st fret | F, 1st inversion | F | all fretted |
| x5355x | 3rd fret | D, root position | E | barred |
| x57560 | 5th fret | D, root position | F | 1 open string |
| x77768 | 6th fret | E, 9th in the bass | C | barred |
| xx7968 | 6th fret | A, 2nd inversion | C | all fretted |
| 10-8-x-9-10-8 | 8th fret | D, root position | C | all fretted |
| x-8-10-9-10-10 | 8th fret | F, 1st inversion | D | barred |
| 10-12-10-10-10-12 | 10th fret | D, root position | E | barred |
The same notes rebuilt from scratch give 12 drop 2, 8 drop 3, 13 rootless and 6 open string voicings, each on its own page.
Tensions. A shell of Dm9, 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 Dm9 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.
In which keys. Every note of Dm9 belongs to C major (the ii, the supertonic), D minor (the i, the tonic), F major (the vi, the submediant) and A minor (the iv, the subdominant).
Every note of Dm9 is in D dorian and D natural minor.
Change one note of Dm9 and you have Dm69 (the flat seventh becomes a sixth), Dm7 (drop the ninth), Dm11 (add the fourth), DmMaj9 (the flat seventh becomes a major seventh), Dmadd9 (drop the flat seventh) or D9 (the minor third becomes a major third).
Dm9 is a minor chord — root, minor third, fifth. Minor chords on every root.
On Dm9’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.