Origins of rock and roll "Rock and Roll" Harris. These songs were generally classed as "race music" or, from the late 1940s, "rhythm and blues", and were barely known by mainstream white audiences. However, in 1951, Cleveland disc jockey Alan Freed began broadcasting rhythm, blues, and country music for a multi-racial audience. Freed, familiar with the music of earlier decades, used the phrase rock and roll to describe the music he aired over station WJW (850 AM); its use also is credited to Freed's sponsor, record store owner Leo Mintz, who encouraged Freed to play the music on the radio. Originally Freed used the name
Canadian Disc Jockey Association professional values and high standards that members are expected to follow. Individuals can apply for CDJA membership only after they have submitted a signed acknowledgement that they will conform to and operate within the code. The CDJA has 11 chapters across Canada. Canadian Disc Jockey Association The Canadian Disc Jockey Association (CDJA) is a not-for-profit trade association for disc jockeys across Canada. The CDJA was formed in 1976 and incorporated in 1978 to serve not only the disc jockey trade but the consumer, as well. It is a self-regulating association and operates under a national constitution and code of ethics.