The third voice from the top lowered an octave. The dropped voice becomes the bass, which is why a string is skipped.
G6 is G, B, D and E — G with a major sixth added on top.
It sounds warm, and finished without being sweet. It closes a tune as firmly as the triad does but without the maj7’s shine, which is why so many standards end on one.

| G | B | D | E |
|---|---|---|---|
| 1 | 3 | 5 | 6 |
Tonic — an ending chord.
Also written Gmaj6, GM6 or G major 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.
G6 has 10 of them, on strings 5-3-2-1 and strings 6-4-3-2, from the 2nd fret up to the 99th — every inversion the chord has: G in the bass, B in the bass, D in the bass and E in the bass. The one to learn first is the B shape at the 2nd fret.
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 320000 — no barre and 4 open strings. 1 of the 10 shapes here sits in open position. 4 of the 10 need a barre. Together they cover the neck from the 2nd fret to the 15th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| 320000 | open position | G, root position | E | 4 open strings |
| 3x243x | 2nd fret | G, root position | D | all fretted |
| 3x5453 | 3rd fret | G, root position | G | all fretted |
| 35x453 | 3rd fret | G, root position | G | all fretted |
| xx5757 | 5th fret | G, root position | B | all fretted |
| x-10-9-9-8-x | 8th fret | G, root position | G | all fretted |
| x-10-12-12-12-12 | 10th fret | G, root position | E | barred |
| x-14-12-12-12-12 | 12th fret | B, 1st inversion | E | barred |
| 15-14-14-12-12-12 | 12th fret | G, root position | E | barred |
| 12-14-12-12-15-12 | 12th fret | E, 6th in the bass | E | barred |
The same notes rebuilt from scratch give 5 shell, 15 drop 2 and 6 open string voicings, each on its own page.
Tensions. A shell of G6, 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 G6 is Am7 to D7 — the ii and the V of G — and D7 shares its third and seventh with Am7, so the hand barely moves between them.
In which keys. Every note of G6 belongs to C major (the V), D major (the IV), E minor (the ♭III), G major (the I), A minor (the ♭VII) and B minor (the ♭VI).
Every note of G6 is in G major pentatonic, G major, G lydian, G mixolydian and G lydian dominant.
Change one note of G6 and you have G (drop the sixth), Gmaj7 (the sixth becomes a major seventh), Gm6 (the major third becomes a minor third), Gadd9 (the sixth becomes a ninth), G69 (add the ninth) or G7 (the sixth becomes a flat seventh).
G6 is a major chord — root, major third, fifth. Major chords on every root.
On G6’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.