guitar chord
G♯add9
A major triad with a ninth added and no seventh — which is what tells it apart from a ninth chord.
Written the other way round it is A♭add9 — the same twelve keys on a piano, a different piece of notation.
Every fingering that fits a hand
4313xx
hard
xx6546
hard
4363xx
hard · no 5
xba8bx
hard
xbadbx
hard · no 5
What is true of it
G♯add9 is G♯, B♯, D♯ and A♯ — 1, 3, 5 and 9 counted from G♯.
On an instrument that cannot reach all 4, the 5 goes first, in that order.
The easiest of the 5 fingerings below is 4313xx: 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.
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♯add9/B♯
8b88b8
G♯add9/D♯
xx1314
G♯add9/A♯
x1111x
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.