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American blues musician Jessie Mae Hemphill (1923 - 2006) performs at the Chicago Bluesfest, Chicago, Illinois, June 7, 1990. (Photo by Paul Natkin/Getty Images)

American blues musician Jessie Mae Hemphill (1923 - 2006) performs at the Chicago Bluesfest, Chicago, Illinois, June 7, 1990. (Photo by Paul Natkin/Getty Images)