To play the A6 chord, perform a barre by pressing your index finger on the top g-string and E-string on the 2nd fret, ring finger on the 4th fret of the C-string, and little finger on the 4th fret of the bottom A-string.
The A6 chord contains the notes A-C#-E-F#.
To build an A6 chord, take the added sixth chord formula (1-3-5-6) and apply it to the A major scale (A, B, C#, D, E, F#, G#).
Identify the first, third, fifth, and sixth scale degrees in the A major scale, which are A-C#-E-F#, giving you an A6 chord.
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