Seminal figures in the evolution of free or nonidiomatic improvisation, guitarist Derek Bailey and percussionist/pocket trumpeter John Stevens are heard in a 1989 London performance vividly captured by Michael Gerzon at The Duke of Wellington, their restless and enthusiastic interplay shifting from angular invention to lyrical reflection in a compelling document of their remarkable rapport.

Live recordings from 1973-74 from the trio of drummer John Stevens, guitarist Derek Bailey, and saxophonist Trevor Watts, dynamic works performed "impromptu" with a wealth of ideas as these innovators demonstrate the skills that helped define them as masterful players.