Mary Lou Williams (1910-1981) was an influential American jazz pianist, composer, and arranger, renowned for her work in both the swing and bebop genres. Born in Atlanta, Georgia, she moved to Pittsburgh, where she developed her early musical skills. Williams gained prominence in the 1930s and 1940s, working with prominent big bands, including those of Andy Kirk and Duke Ellington. Her notable works include compositions such as "Zodiac Suite," "Roll 'Em," and "The Boy Who Stood on the Corner." Williams was a pioneering figure in jazz, known for her innovative arrangements and ability to bridge various styles, including gospel and classical influences. In addition to her performance career, she played a crucial role in mentoring younger musicians, including Thelonious Monk and Dizzy Gillespie, and was a key advocate for women in jazz. Her contributions to the genre helped pave the way for future generations of jazz artists, solidifying her legacy as one of the most important figures in American music history. Williams was recognized for her talent with several awards, including a posthumous Grammy Lifetime Achievement Award in 2019.