If you add a third to any triad, you obtain a seventh chord. This chord is called seventh chord because a seventh interval is formed in relation to the root.

Seventh chords may be built on each of the degrees of major and minor scales. Seventh chords may be identified by analyzing the triad and the seventh interval forming the chord.

The following examples show the structure and examples of the most common seventh chords:

dominant seventh

Dominant Seventh: major triad, minor 7th

Major Sevenths

Major Seventh: major triad, major 7th

minor sevenths

Minor Seventh: minor triad, minor 7th

diminished sevenths

Diminished Seventh: diminished triad, diminished 7th

half diminished sevenths

Half Diminished Seventh: diminished triad, minor 7th

See C > Chord for related entries.


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José Rodríguez Alvira.