A 1791 biography of which English writer by James Boswell is often considered the greatest biography ever written?

Which title character's wedding day is the subject of a 1786 Mozart opera? Which title is shared by a 1787 Mozart serenade and a 1973 Stephen Sondheim musical? A 1788 marble statue of George Washington by which French sculptor stands in Virginia's state capitol? A 1790s engraving by Robert Dodd shows which "Bounty" captain and some of his officers being set adrift? A 1791 Handel festival in London inspired which composer to write "The Creation"? A 1795 land fraud concerned land near the Yazoo, a tributary of which river? A 1795 partition ended which East European state's existence until it returned as a republic in 1918? Which Ugandan dictator, who ruled from 1971 to 1979, married a young soldier named Sarah in 1975?