Donald Johnson Ellis was an American jazz trumpeter, drummer, composer, and bandleader. He is best known for his extensive musical experimentation, particularly in the area of time signatures. Later in his life he worked as a film composer, contributing a score to 1971's The French Connection and 1973's The Seven-Ups.

Steve Swallow is an American jazz bassist and composer, known for his collaborations with Jimmy Giuffre, Gary Burton, and Carla Bley. He was one of the first jazz double bassists to switch entirely to electric bass guitar.