 He also started to perform on network radio again, first with the "Schaefer All-Star Parade" on NBC, which ran from 1938 to 1940, as well as the NBC Blue Network's "Music Appreciation Hour" in 1938, and the "RCA Magic Key [The Magic Key]" during the 1938–39 season.Knight also had a weekly program on the radio station WEAF (later known as WNBC (AM)) every Thursday.In 1938, he was one of the finalists on NBC's "Metropolitan Opera Auditions of the Air", losing to John Carter by a single vote.