Where did the third collaboration open by Richard Rodgers  and Oscar Hammerstein II , The form began to flourish in the late 1960s?
Allegro (musical):  Opening on Broadway on October 10, 1947, the musical centers on the life of Joseph Taylor, Jr., who follows in the footsteps of his father as a doctor, but is tempted by fortune and fame at a big-city hospital.
i don't know