 Various other musicians recorded and toured with the duo at various times, notably including drummer Dannie Richmond, a long-time associate of jazz bassist Charles Mingus.In 1963, Jon Mark, using his given name John Michael Burchell, and a former schoolmate, Alun Davies; singer-songwriter, folk guitarist and skiffle musician, (later of Cat Stevens' band), recorded as a duo, an album entitled "Relax Your Mind", on Decca Records.From 1965 on, Mark accompanied Marianne Faithfull on her recordings and concerts.