Derek Bailey was an English avant-garde guitarist and an important figure in the free improvisation movement. Bailey abandoned conventional performance techniques found in jazz, exploring atonality, noise, and whatever unusual sounds he could produce with the guitar. Much of his work was released on his own label Incus Records. In addition to solo work, Bailey collaborated frequently with other musicians and recorded with collectives such as Spontaneous Music Ensemble and Company.

Barry John Guy is an English composer and double bass player. His range of interests encompasses early music, contemporary composition, jazz and improvisation, and he has worked with a wide variety of orchestras in the UK and Europe. He studied at the Guildhall School of Music under Buxton Orr, and later taught there.