Augmented chords
What is an augmented chord?
Augmented chords are unstable, or tense sounding chords. They are typically written as "+" or "aug". They are usually used as a passing chord between to other chords because of the tension in their sound. They also tend to be lead by that sharp 5th to the next half step up.
The augmented chord formula is: 1 - 3 - #5 (or +5)
(basically this is playing 3 Major 3rds in a row)
So augmented triads are as follows: (thanks for the tips Jim in Michigan)
A = A - C# - E#
B = B - D# - F##
C = C - E - G#
D = D - F# - A#
E = E - G# - B#
F = F - A - C#
G = G - B - D#
Check how to play diminished chords or 7 chords. If you want more complete lessons on how to play guitar chords, we recommend tyring Learn and Master Guitar. By far the best guitar instructioanl program out there.