"Hemsley had been a jazz keyboardist before portraying Jefferson on television, and his progressive sensibilities led him to appreciate the offbeat sounds of Allen and Gong. Apparently, cosmic Gong compositions such as “Flying Teapot” and “Pot Head Pixies” resonated with the TV star’s psyche."
—
George Jefferson: World’s Biggest Gong Fan?
Some fantastic reporting by Krucoff drew my attention to possibly the best thing I will learn all year: Sherman Hemsley was a prog rock fanatic. This article also says he made an album with Jon Anderson from Yes.