10 Facts About Seventh chord

Seventh chord is a chord consisting of a triad plus a note forming an interval of a seventh above the chord's root.

Dominant seventh chord, or major-minor seventh chord is a chord composed of a root, major third, perfect fifth, and minor seventh.

When we arrange the notes of the C major scale in ascending pitch and use only these notes to build a seventh chord, and we start with G, then the resulting chord contains the four notes G–B–D–F and is called G dominant seventh.

Harmonic seventh chord is a dominant seventh chord formed by a major triad plus a harmonic seventh interval.

Frequent use of the harmonic seventh chord is one of the defining characteristics of blues and barbershop harmony; barbershoppers refer to it as "the barbershop seventh".

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Half-diminished seventh chord is a seventh chord built from the seventh degree of a major scale.

The half-diminished seventh chord uses a minor seventh over the root of a diminished triad.

The diminished seventh chord has been used by composers and musicians for a variety of reasons over time.

The diminished seventh chord is seen more frequently in late classical and romantic period works but is found in Baroque and Renaissance period works, though not as frequently.

All of the elements of the diminished seventh chord can be found in the dominant seventh flat nine chord as seen in a comparison of the two chords.