LESS OFTEN USED SEVENTH CHORDS

This chapter describes the seventh chords that are used less often. 

An augmented seventh chord in its root close position is built by stacking the diminished third over the augmented triad chord. It can be also imagined as the dominant seventh chord with the raised fifth. The symbol for the augmented seventh chord is the chord root suffixed with the symbol +7.

Figure: The G augmented seventh chord in the root close position and its symbol

The following two seventh chords have names that are the combination of the names of another two seventh chords. They can be imagined as the combination of the two different seventh chords.

A minor-major seventh chord in its root close position is built by stacking the major third over the minor triad chord in the root close position. The symbol for the minor-major seventh chord is the chord root suffixed with the symbol m∆7. The minor-major seventh chord can be imagined as the combination of the minor seventh chord and the major seventh chord. 

Figure: The A minor-major seventh chord in the root close position and its symbol

An augmented-major seventh chord in its root close position is built by stacking the minor third over the augmented chord in the root close position. The symbol for the augmented-major seventh chord is the chord root suffixed with the symbol +∆7. The augmented-major seventh chord can be imagined as the combination of the augmented seventh chord and the major seventh chord.

Figure: The C augmented-major seventh chord in the root close position and its symbol