In addition to adding sevenths and ninths to triads, it is also possible to add elevenths and thirteenths. A triad to which the seventh, ninth, eleventh, and thirteenth are added will contain the seven notes of the scale:

chord

Due to sound density, one or more notes are usually eliminated from these chords. It is also common to eliminate the third, especially in the case of eleventh chords. The following excerpt shows an example of these chords:

Debussy

Gb Dominant 7th chord with 9th (Ab), 11th (Cb) and 13th (Eb)
C. Debussy, …La fille aux cheveux de lin
Read a complete analysis.

See C > Chord for related entries.




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