Mary Lou Williams.
To say that Mary Lou Williams had a long and productive career is an understatement. Although for decades she was often called jazz's greatest female musician (and one has to admire what must have been a nonstop battle against sexism), she would have been considered a major artist no matter what her sex. Just the fact that Williams and Duke Ellington were virtuall y the only stride pianists to modernize their style through the years would have been enough to guarantee her a place in jazz history books. Williams managed to always sound modern during a half-century career without forgetting her roots or how to play in the older styles. Born Mary Elfrieda Scruggs (although she soon took the name of her stepfather and was known as Mary Lou Burley), she taught herself the piano by ear and was playing in public at the age of six. Growing up in Pittsburgh, Williams ' life was always filled with music. When she was 13, she started working in vaudeville, and three years