Who was general manager of the Metropolitan Opera from 1950 to 1972?

Which Brat Pack actress was watched over by Patrick Swayze's ghost in the 1990 film "Ghost"? Bratislava, capital of which eastern neighbor of the Czech Republic, was known as Pressburg until 1919? Spoiled Mary Lennox becomes the ward of her English uncle in which 1911 Frances Hodgson Burnett classic? Which phrase for a final effort before retirement is also the title of a 1958 Spencer Tracy film about a big-city mayor? Brazil abolished which institution in 1888, 23 years after the United States? "Breaker, breaker" - which song by C.W. McCall topped the charts in early 1976? Which breakfast food's name can also be used as a verb meaning "to flatten completely"? Which country entered World War I in April 1917, helping break the long stalemate on the Western Front?