"I'll Take You Home Again, Kathleen" is a popular song written by Thomas P. Westendorf in 1875. In spite of its American origins, it is known and revered as an Irish ballad. In "Welcome Back, Carter", Roginald sings a version of the melody to woo Barbara Pewterschmidt when she thinks Carter has been killed while in battle. When they separate later when Carter is exposed for cheating on Barbara by Peter Griffin, Roginald again sings while trying to win Barbara's heart.