CKLG initially began with an easy listening format, but in the fall of 1967, it started experimenting with rock music at night. In October that year, CKLG program director Frank Callaghan hired record store owner Bill Reiter (who later went on to become part of the Dr. Bundolo's Pandemonium Medicine Show comedy troupe) to host the jazz/blues program "Groovin' Blue" on Saturday evenings. CKLG-FM soon shifted to become Canada's first full-time FM rock station on March 16, 1968, with the expansion of "Groovin' Blue" to six nights a week and the addition of tracks from rock, folk and popular albums. In 1970, CKLG-FM added a two-hour daily talk show hosted by Allen Garr, which ran on the station until 1975. By 1973, CKLG-FM had compiled a library of 3000 albums, and all its programming was aired live except on Sunday mornings, with special programming on the station including the Allen Garr talk show, live concerts and a Saturday sock-hop program. In 1976, under the guidance of new program director Roy Hennessy (a former morning host on CKLG-AM), the FM station made the gradual transition to a progressive rock format.