From AFRTS archive blog:

Bill Stewart was one of the KMPC talent that had the AFRTS gig. He was the Bill of the KMPC jingle..."Ira, Johnny, Bill and Dick!" Bill graced LA playing his mixture of Swing, jazz and MOR at several great stations. KMPC, 1951-59; KGIL, 1965-66; KRHM, 1966 and 1969; KGIL, 1973-75. For Armed Forces Radio he hosted "A Quarter Century of Swing." In 1969, the 30-year veteran was honored with a concert at the Palladium. For 20 years he did in-flight airline music programming. Bill died in 1993 of congestive heart failure. Bill Stewart, and a few other hosts, recorded and stored their shows at AFRTS-LA for four to six months prior to air. Bill Stewart never mentioned "it's the Monday edition" or "it's the Tuesday edition" the way Roger Carroll did for his series. Probably due to the inordinate delay in recording the Bill Stewart Shows. He just didn't know what day the show was to be aired. When Bill Stewart says "this song is a new release", it really isn't. . .it's four to six months old!