Grachan Moncur III (born June 3, 1937) is an American jazz trombonist. He is the son of jazz bassist Grachan Moncur II and the nephew of jazz saxophonist Al Cooper. Born in New York City (his father’s father was from the Bahamas) and raised in Newark, New Jersey, Grachan Moncur III began playing the cello at the age of nine, and switched to the trombonewhen he was 11.^[1] In high school he attended the Laurinburg Institute in North Carolina, the private school where Dizzy Gillespie had studied. While still at school he began sitting in with touring jazz musicians on their way through town, including Art Blakey and Jackie McLean, with whom he formed a lasting friendship.