Western Music History/Contemporary Music
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The Contemporary Music period is the period following the Modern Music period. It is generally considered to have lasted from 1945 A.D. to the present.
Contemporary music is (in general) based on originality. Then Contemporary artists use dissonances and try to desobey of all the law that are imposed to music for to many years now.
Contemporary music is divided in a lot of categories like the "minimalism" a style that have been explorated by many artists like Steve Reich, John Adams, and Philip Glass.