 Sangster formed his own quartet and experimented with group improvisatory jazz, after he became interested in the music of such musicians as Sun Ra and Archie Shepp.He rejoined the Don Burrows Group briefly in 1967 when they represented Australia at Expo 1967 in Montreal, Quebec, Canada.In 1969 Sangster began to work with rock musicians and he joined the expanded lineup of the Australian progressive rock group Tully, who provided the musical backing for the original Australian production of the rock musical "Hair".