The third voice from the top lowered an octave. The dropped voice becomes the bass, which is why a string is skipped.
Gm6 is G, Bb, D and E — Gm with a major sixth added on top.
It sounds bittersweet — minor underneath, major on top. The major sixth over a minor triad comes from the melodic minor, and it is the classic jazz minor tonic.

| G | Bb | D | E |
|---|---|---|---|
| 1 | ♭3 | 5 | 6 |
Minor tonic — an ending chord in a minor key.
Also written Gmin6, G-6 or G minor 6. 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.
Gm6 has 10 of them, on strings 5-3-2-1 and strings 6-4-3-2, from open position up to the 14th — every inversion the chord has: G in the bass, Bb in the bass, D in the bass and E in the bass. The one to learn first is the Bb shape at the nut.
5 of them sit on strings 5-3-2-1, 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 xx5756 — no barre and low, at the 5th fret. None of the shapes for Gm6 uses an open string, so every one of them is movable; the lowest sits at the 2nd fret. 4 of the 9 need a barre. Together they cover the neck from the 2nd fret to the 15th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| 3x2333 | 2nd fret | G, root position | G | barred |
| 355353 | 3rd fret | G, root position | G | barred |
| xx5756 | 5th fret | G, root position | Bb | all fretted |
| x-10-8-9-8-10 | 8th fret | G, root position | D | all fretted |
| x-10-12-9-11-x | 9th fret | G, root position | Bb | all fretted |
| x-10-12-x-11-12 | 10th fret | G, root position | E | all fretted |
| x-x-12-12-11-12 | 11th fret | D, 2nd inversion | E | barred |
| x-13-14-12-15-x | 12th fret | Bb, 1st inversion | D | all fretted |
| 15-x-14-15-15-x | 14th fret | G, root position | D | barred |
The same notes rebuilt from scratch give 7 shell, 15 drop 2 and 6 open string voicings, each on its own page.
Tensions. A shell of Gm6, root, third and seventh, leaves a string free, and the tones that belong over it are the 9 (A) and the 11 (C).
How you get to it. The turn that lands on Gm6 is Am7♭5 to D7♭9: the ii and the V of G minor, which is where a minor tonic is usually arrived at rather than simply begun on.
In which keys. Every note of Gm6 belongs to D minor (the iv, the subdominant) and F major (the ii, the supertonic).
Every note of Gm6 is in G dorian, G melodic minor and G half-whole diminished.
Change one note of Gm6 and you have Gm (drop the sixth), Gdim7 (the fifth becomes a flat fifth), Gm69 (add the ninth), Gm7 (the sixth becomes a flat seventh), GmMaj7 (the sixth becomes a major seventh) or Gmadd9 (the sixth becomes a ninth).
Gm6 is a minor chord — root, minor third, fifth. Minor chords on every root.
On Gm6’s sound and use this page follows Mark Levine, The Jazz Piano Book (Sher Music, 1989). 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.