The third voice from the top lowered an octave. The dropped voice becomes the bass, which is why a string is skipped.
Fm9 is F, Ab, C, Eb and G — Fm7 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.

| F | Ab | C | Eb | G |
|---|---|---|---|---|
| 1 | ♭3 | 5 | ♭7 | 9 |
Pre-dominant or minor tonic — an m7’s job with more colour.
Also written Fmin9, F-9 or F minor 9. The same chord either way; which spelling you meet depends on who wrote the chart.
The same operation one voice further down: the third voice from the top falls an octave and becomes the bass.
That leaves a bigger hole under the top three notes, so a string gets skipped: the muted string in the middle is the shape, not a mistake.
Fm9 has 7 of them, on strings 6-4-3-2 and strings 5-3-2-1, from open position up to the 9th — every inversion the chord has: F in the bass, Ab in the bass, Eb in the bass and G in the bass. The one to learn first is the G shape at the nut.
4 of them sit on strings 6-4-3-2, so you can run the inversions up one set without changing strings — which is the whole reason to learn them as a family rather than as separate grips.
Start with x33044 — no barre and 1 open string. 1 of the 10 shapes here sits in open position. 6 of the 10 need a barre. Together they cover the neck from the 1st fret to the 15th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| 131113 | 1st fret | F, root position | G | barred |
| x33044 | open position | C, 2nd inversion | Ab | 1 open string |
| 465564 | 4th fret | Ab, 1st inversion | Ab | all fretted |
| x8688x | 6th fret | F, root position | G | barred |
| x-10-10-10-9-11 | 9th fret | G, 9th in the bass | Eb | barred |
| x-x-10-12-9-11 | 9th fret | C, 2nd inversion | Eb | all fretted |
| 13-11-13-0-13-13 | 11th fret | F, root position | F | barred |
| 13-11-x-12-13-11 | 11th fret | F, root position | Eb | all fretted |
| x-11-13-12-13-13 | 11th fret | Ab, 1st inversion | F | barred |
| 13-15-13-13-13-15 | 13th fret | F, root position | G | barred |
The same notes rebuilt from scratch give 3 shell, 11 drop 2, 13 rootless and 1 open string voicings, each on its own page.
Tensions. A shell of Fm9, root, third and seventh, leaves a string free, and the tones that belong over it are the 11 (Bb) and the 13 (D).
How you get to it. The turn that lands on Fm9 is Gm7♭5 to C7♭9: the ii and the V of F minor, which is where a minor tonic is usually arrived at rather than simply begun on.
In which keys. Every note of Fm9 belongs to C minor (the iv, the subdominant), Eb major (the ii, the supertonic), F minor (the i, the tonic) and Ab major (the vi, the submediant).
Every note of Fm9 is in F dorian and F natural minor.
Change one note of Fm9 and you have Fm69 (the flat seventh becomes a sixth), Fm7 (drop the ninth), Fm11 (add the fourth), FmMaj9 (the flat seventh becomes a major seventh), Fmadd9 (drop the flat seventh) or F9 (the minor third becomes a major third).
Fm9 is a minor chord — root, minor third, fifth. Minor chords on every root.
On Fm9’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.