Plot: Host: Jack Benny --Jack Benny appears with Gloria Chappell, his musical teacher, for a violin duet. --Petula Clark - ""Winchester Cathedral"" & ""This Is My Song"" --Johnny Mathis - medley from ""Man of La Mancha"" --Ernie Terrell and the Heavyweights (heavyweight boxer Terrell with his brothers and sister) - ""A Hammer and a Nail"" --The Nitwits (musical comedians) - ""Cool, Cool Water"" --Brascia and Tybee (dancers) - ""Mambo Flamenco"" --The Halasis (acrobats, teeterboard act from Hungary)