guitar chord
A♭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 G♯6 — the same twelve keys on a piano, a different piece of notation.
Every fingering that fits a hand
4635xx
hard
4335xx
hard · no 5
4331xx
hard · no 5
xx6564
hard · no 5
xx6868
moderate · barre
What is true of it
A♭6 is A♭, C, E♭ and F — 1, 3, 5 and 6 counted from A♭.
These are also the notes of Fm7/A♭. 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 4635xx: 4 fingers, held at the 3rd 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 A♭, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
A♭6/C
88a898
A♭6/E♭
xx1111
A♭6/F
131111
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.