According to Wikipedia,
Gene Nobles was an American radio disc jockey who attained fame on Nashville radio station WLAC from the 1940s through the 1970s by playing rhythm and blues music. Career Nobles was a former carnival barker, bingo dealer, and announcer on several small Southern radio stations. He became the first Euro-American disc jockey on radio to play popular African-American music regularly. He started this practice before early rock-and-roll jockeys such as Alan Freed and before his fellow WLAC announcers "John R." Richbourg, Bill "Hoss" Allen, and Herman Grizzard. The four WLAC announcers produced evening and late-night shows featuring R&B, soul music, and gospel music. They attracted an audience of African-Americans and Euro-American teenagers well into the early 1970s.