Triads, seventh chords, ninth chords, eleventh chords and thirteenth chords.

Chords are regular and divided, and have no specific number.

Each chord tone is superimposed according to the third degree relationship. A triad is three tones superimposed according to a third degree relationship. A seventh chord is four tones, a ninth chord is five tones, and an eleventh chord is It has six tones, and a thirteenth chord has seven tones.