Which famous D.C. address was the title of a 1976 Lerner and Bernstein musical that flopped?

A famous 1936 radio speech by which man began "At long last I am able to say a few words of my own"? A famous ad campaign that began in 1967 told folks that which soft drink was "the Uncola"? A famous landscape painted around 1595 by El Greco shows a view of which Spanish city? Which famous dance partner was born Virginia Katherine McMath? A famous group of blacklisted screenwriters and directors of the 1950s was known as the Hollywood what? The first of these was famously sent on May 24, 1844, and Western Union sent its last one on January 27, 2006. What are… A famous scene from which 1976 film was ad-libbed, as the script simply read "Travis looks in the mirror"? The famous symbol of the Pinkerton Detective Agency is an eye with the slogan "We never..." what?