The Chicago blues reference article from the English Wikipedia on 24-Jul-2004
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Chicago blues

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The Chicago blues is a form of blues music that developed in Chicago by adding electricity, drums, piano, bass guitar and sometimes saxophone to the basic string/harmonica Delta blues. The music developed mainly as a result of the "Great Migration" of poor black workers from the South into the industrial cities of the North, and Chicago in particular, in the first half of the twentieth century.

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