guitar chord
G♭6
A major triad with a sixth added. The same four notes as a minor seventh chord a third below.
Written the other way round it is F♯6 — the same twelve keys on a piano, a different piece of notation.
Every fingering that fits a hand
2413xx
hard
2113xx
hard · no 5
xx4342
hard · no 5
xx4646
moderate · barre
xx4346
hard · no 5
What is true of it
G♭6 is G♭, B♭, D♭ and E♭ — 1, 3, 5 and 6 counted from G♭.
These are also the notes of E♭m7/G♭ and D♯m7/G♭. Which name is right depends on what is underneath and what came before — the notes alone do not decide.
On an instrument that cannot reach all 4, the 5 goes first, in that order.
The easiest of the 5 fingerings below is 2413xx: 4 fingers, held at the 1st fret.
None of them uses an open string, so this chord moves up the neck unchanged — the same shape 1 fret higher is the chord a semitone above.
1 of the 5 need a barre.
2 strings stay silent.
Where its notes are on the neck
The brass dots are G♭, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
G♭6/B♭
668676
G♭6/D♭
xxbbbb
G♭6/E♭
bdbbbb
An inversion is the same chord with a different note lowest. The name changes to a slash name because the bass is what a listener hears as the foundation.