Black Pearls: Blues Queens of the 1920'sThroughout the 1920s, in tents, theaters, dance halls and cabarets, and on "race" records, black American women captivated large audiences with their singing of the blues. University of Maryland professor Harrison examines the subjects and texts of their songs, the toll these performers paid for their right to be heard, and what they did to transform a folk tradition into a popular art. She describes the singing and lifestyles of Sippie Wallace,