guitar chord
C♯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 D♭6 — the same twelve keys on a piano, a different piece of notation.
Every fingering that fits a hand
x4332x
hard · no 5
x4636x
hard
x4336x
hard · no 5
9b8axx
hard
988axx
hard · no 5
What is true of it
C♯6 is C♯, E♯, G♯ and A♯ — 1, 3, 5 and 6 counted from C♯.
These are also the notes of A♯m7/C♯ and B♭m7/C♯. 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 x4332x: 4 fingers, held at the 2nd 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.
It leaves out the 5. 6 strings cannot carry 4 notes, and the 5 is the one this chord can lose without changing what it is.
2 strings stay silent.
Where its notes are on the neck
The brass dots are C♯, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
C♯6/E♯
113121
C♯6/G♯
xx6666
C♯6/A♯
686666
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.