Paul Bley, CM was a Canadian jazz pianist known for his contributions to the free jazz movement of the 1960s as well as his innovations and influence on trio playing and his early live performance on the Moog and ARP synthesizers. His music has been described by Ben Ratliff of the New York Times as "deeply original and aesthetically aggressive". Bley's prolific output includes influential recordings from the 1950s through to his solo piano recordings of the 2000s.

Carla Bley was an American jazz composer, pianist, organist, and bandleader. An important figure in the free jazz movement of the 1960s, she was perhaps best known for her jazz opera Escalator over the Hill, as well as a book of compositions that have been performed by many other artists, including Gary Burton, Jimmy Giuffre, George Russell, Art Farmer, Robert Wyatt, John Scofield, and her ex-husband Paul Bley. She was a pioneer in the development of independent artist-owned record labels, and recorded over two dozen albums between 1966 and 2019.