Musical variety episode featuring conductor and arranger Mitch Miller's popular ""Sing Along With Mitch"" format adapted from record albums for television. Miller and guests invite participation from the audience in the sing-along segments. Opening segment: Sing Along, Heart of My Heart, Do-Re-Mi -- Twenties segment: Singin' in the Rain, All I Do is Dream of You, Toot Toot Tootsie Goodbye, Pretty Baby, Bumble Bee, Baby Face, It's Three O'Clock in the Morning -- I'm Just a Little Sparrow in the Nest of the Lord / performed by Leslie Uggams -- Block party segment: The Children's Marching Song, School Days, Sweet Rosie O'Grady, Sidewalks of New York, The Band Played On, Oh, You Beautiful Doll, Beer Barrel Polka -- A Guy is a Guy / performed by Diana Trask -- Soldier segment: My Buddy, Hinky Dinky Parlez-vous, There's a Long, Long Trail, Give My Regards to Broadway -- Greenfields / performed by the Brothers Four -- Bouncing ball segment: Let Me Call You Sweetheart, A Bicycle Built for Two,