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major--minor key system began to be threatened. By the end of the period, keys often shifted so rapidly in the course of a composition that tonality itself began to break down."
:Post-Romantic and Impressionistic Period (1875--1920) "With the breakdown of the major--minor key system, impressionist composers began to experiment with other scales....particularly...pentatonic, modal, and whole-tone scales."
:Contemporary Period (1920--present) "The chromatic scale has predominated in much of the music of our period."
:Jazz

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