To play the Gaug chord, place the middle finger on the 3rd fret of the C-string, ring finger on the 3rd fret of the E-string, and index finger on the 2nd fret of the bottom A-string. Let the other string ring open.
The Gaug chord contains the notes G-B-D#.
To build a Gaug chord, take the augmented triad formula (1-3-#5) and apply it to the G major scale (G, A, B, C, D, E, F#).
Identify the first, third, and fifth scale degrees in a G major scale which are G-B-D.
Because the fifth scale degree is a "#5" (said "sharp five") raise the D note a half step to D# making the chord augmented with the notes G-B-D#.
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