Though technically not a blues performer, Mamie Smith notched her place in American music as the first black female singer to record a vocal blues. That record was "Crazy Blues" (recorded August 10, 1920), which sold a million copies in its first six months and made record labels aware of the huge potential market for "race records"; thus paving the way for Bessie Smith (no relation) and other blues and jazz performers. An entertainer who sported a powerful, penetrating, feminine voice with belting vaudeville qualities, as opposed to blues inflections, Smith toured as a dancer...