About the Caug chord
To play C augmented, use the first shape above. Place your index finger on the 1st fret of the G string and your pinky finger on the 3rd fret of the A string. Leave the C and E strings open. Strum all four strings and check that each one rings cleanly.
Root
C
Quality
Augmented
Notes
C · E · G#
How the Caug chord works
C
Root(1)
The home note. It gives the chord its name.
E
Major third(3)
The major-third interval that establishes the chord's major base.
G#
Augmented fifth(♯5)
A raised fifth that expands the triad.