The liner notes say this about Gentle Giant:
"Gentle Giant was one of the few bands at the time to use a quad sound system for their live show. With the stage dark, a white spotlight shone on Kerry Minnear at his keyboard, who was dressed as if in another time. Saxophonist Derek Shulman would sing, regardless of who originally sang in the studio, and the other members- Gary Green (guitar), Ray Shulman ( bass guitar, violin), and John Weathers (drums), played and acted their parts, while a hushed held on to every breath. Their figures illuminated across a picture slide background. The Runaway and Proclamation were recorded at the Academy of Music on January 18, 1975."