Biography: Charles Mingus Jr. (April 22, 1922 – January 5, 1979) was an American jazz double bassist, pianist, composer, and bandleader. A major proponent of collective improvisation, he is considered to be one of the greatest jazz musicians and composers in history, with a career spanning three decades and collaborations with other jazz musicians such as Louis Armstrong, Duke Ellington, Charlie Parker, Dizzy Gillespie, and Herbie Hancock.