Duke Ellington said, "Mary Lou Williams is perpetually contemporary. Her music retains, and maintains, a standard of quality that is timeless. She is like soul on soul." Her longevity as a top-flight jazz artist was extended because of her penchant for adapting to and influencing stylistic changes in the music. With Ronnie Boykins and legendary drummer Roy Haynes, this live concert from the mid 1970s shows the many facets of the great pianist / arranger / composer, Mary Lou Williams.