Extended Chord - 20th Century

20th Century

In the 20th century, especially in jazz and popular music, 9th chords were used as elaborations of simpler chords, particularly as substitutes for the tonic triad at the end of a piece. The "'piling up'" of thirds above the tonic to make 7th, 9th, 11th, or even 13th chords "is one of the most important characteristics of jazz harmony".

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