Sproton Layer was an American rock and roll group formed in Ann Arbor, Michigan in the late 1960s. Their music was mostly hard rock with psychedelic touches. It was composed of bass guitarist, singer and primary songwriter Roger Miller and his younger brothers Benjamin (Ben) Miller on guitar and Laurence B. (Larry) Miller on drums. Trumpeter Harold Kirchen (brother of guitarist Bill Kirchen, a longtime member of Commander Cody and His Lost Planet Airmen) later joined the group. The Miller brothers would later occasionally record under the name M3.