Dewey Phillips bluegrass Bill Monroe Blue Moon of Kentucky jury-rigged echo effect pop Sam Phillips That's All Right Memphis
Three days later, popular Memphis disc jockey Dewey Phillips (no relation to Sam Phillips) played "That's All Right" on his Red, Hot, and Blue show. Listeners began phoning in, eager to find out who the singer was. The interest was such that Phillips played the record repeatedly during the remaining two hours of his show. Interviewing Presley on-air, Phillips asked him what high school he attended to clarify his color for the many callers who had assumed that he was black. During the next few days, the trio recorded a bluegrass song, Bill Monroe's "Blue Moon of Kentucky", again in a distinctive style and employing a jury-rigged echo effect that Sam Phillips dubbed "slapback". A single was pressed with "That's All Right" on the A-side and "Blue Moon of Kentucky" on the reverse.
