Three Do's and A Don't

From the TV show Welcome Back Kotter (). The Sweathogs form this vocal group to compete in a school talent show. Vinnie Barbarino (John Travolta) is the"Don't." In the two part episode "Barbarino in Love" (11/10/77 and 11/17/77), Barbarino falls for Cassy (Amy Johnston) who is also competing, when he should be practicing. He quits rather than compete against her, but changes his mind and rejoins. They both lose to a kid who does bird calls.