S2, E4: The glee club works on a duet assignment, and Finn and Rachel plan to throw the competition so that Sam can have a shot at winning. Meanwhile, a love triangle between Mike, Tina and Artie develop. Musical performances include "Don't Go Breaking My Heart”, "River Deep, Mountain High", "Le Jazz Hot", "Sing!", "With You I'm Born Again", "Lucky" and "Happy Days Are Here Again/Get Happy".