To play the Aaug chord, perform a barre by pressing your index finger on the C-string and E-string on the 1st fret and middle finger on the 2nd fret of the top g-string. Let the other string ring open.
The Aaug chord contains the notes A-C#-E#.
To build a Aaug chord, take the augmented triad formula (1-3-#5) and apply it to the A major scale (A, B, C#, D, E, F#, G#).
Identify the first, third, and fifth scale degrees in an A major scale which are A-C#-E.
Because the fifth scale degree is a "#5" (said "sharp five") raise the E note a half step to E# making the chord augmented with the notes A-C#-E#.
Note: E# is the enharmonic equivalent of F but music theory rules dictate the fifth scale degree is represented by a single letter – in this case "E" which is why we refer to it as an E# for the Aaug chord.
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