Aug chords

”Aug” stands for augmented and in a triad augmented chord there is the root and two major thirds. These chords are quite uncommon and their function is mostly to be placed between two chords that lack distinct relationship.

See diagrams of aug chords:

C aug D aug E aug F aug G aug A aug B aug

C aug7 D aug7 E aug7 F aug7 G aug7 A aug7 B aug7

Theory

There are two categories of augmented chords.

Comparing the C Major Chord with Caug and Caug7:

C: C – E – G
Caug: C – E – G#
Caug7: C – E – G# - A#

The only difference between the C major and C augmented triads is that the fifth is raised, or augmented, one semi-step. The augmented seventh chord adds a minor seventh. It is, however, not as common to write these chords aug7 as +7 or 7#5 (even the less correct 7+ occur).

Formula and steps

The formula for the aug chord is 1 - 3 - #5. There are four half steps to the 2nd note and four half steps to the 3rd.

Alternative chord symbols

Besides the aug chord symbol that is presented on this site, you may find the alternative plus symbol (+), as in C+, also being used occasionally. A third symbol that occurs less commonly is C(#5) instead for Caug (the reason for "#5" is that the fifth is sharpened).