Major triad's first inversion (major sixth chord) is a small 3+a pure 4, and the second inversion (major forty-six chord) is a pure 4+a big 3.
The first inversion (plus 6 chords) of an augmented triad is a big 3+a pure 4, and the second inversion (plus 46 chords) is a pure 4+a big 3.
The first inversion of negative triad (negative 6 chord) is 3 degrees smaller+4 degrees larger, and the second inversion (negative 46 chord) is 4 degrees larger+3 degrees smaller.
The first transposition of minor chord (minor 6th chord) is major 3+a pure 4, and the second transposition (minor 46th chord) is pure 4+a small 3.
Chord introduction
According to the third-degree interval relationship or non-third-degree interval relationship, the combination of three or more sounds is called "chord"
Chords composed according to the relationship between three intervals are widely used because of the tension between sounds, full sound coordination and natural laws of overtones. Although chords composed of non-third intervals are not as widely used as those composed of third intervals, they are of positive significance to enriching harmony colors and establishing national harmony language, which should not be ignored.
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