Guest star: Bobby Vinton Featured the Lennon Sisters, Jimmy Roberts, Norma Zimmer, Jo Ann Castle, Larry Hooper and the Lawrence Welk Orchestra. Highlights: Bobby Vinton sings "Blue Velvet." Bobby Vinton and the Lennon Sisters sing "Moonglow". The Lennon Sisters sing "Catch a Little Moonbeam". Norma Zimmer and Jim Roberts duet on "Tea for Two". Jo Ann Castle performs "Chopsticks". Larry Hooper performs "Practice What You Preach". Lawrence Welk's Orchestra performs "It Seems to Me I've Heard That Song Before", "Fiesta" and "Sukiyaki."