Guests: --Gladys Knight & the Pips - ""If I Were Your Woman"" & ""Bridge Over Troubled Water"" --Sid Caesar & Carol Channing (do a scene from the play ""Four on a Garden"") --Robert Klein (stand-up comedian) - tells jokes about going to the dentist. --Jerry Vale - ""I Want To Make It With You,"" ""My Love, Forgive Me,"" & ""Peace in the Valley"" --Caterina Valente - ""Everybody Gets to go to the Moon,"" ""Mack the Knife"" (in German) & ""The Girl from Impanema"" (in Portuguese) --Peter Nero (pianist) - theme from ""Love Story"" --Pat Henry (comedian) CBS repeated this show on June 6, 1971. NOTE: The 1990's repeat of this episode includes performers from other shows: Jim Bailey (from 3Jan71); Santini Demon (from 15Feb70); O.C. Smith (from 3Jan71) and Jackie DeShannon (circa March 1970).