Charles Mingus Jr., born 1922, was a jazz composer, pianist, and bassist. As a bassist, he developed a strong, unmistakable identity, melding counter melodies and inner harmonies. But his lasting legacy was as a composer. In the early 60s, Mingus composed "The Black Saint and the Sinner Lady" and "Meditations on Integration." He composed over 300 works and left the largest body of jazz compositions after Duke Ellington. His original scores are housed in the Library of Congress, along with Mozart's and Beethoven's.
Reference: Postal Bulletin (August 17, 1995)