What Mozart opera focuses on fiancee swapping as its theme?

More Questions:

How many litres does a Nebuchadnezzar contain?

What two pieces are moved in chess's castling maneuver?

What city provides the setting for "The Phantom of the Opera"?

Which country borders Kyrgystan to the north?

What do all mammals have?

What element did Pierre and Marie Curie discover in 1898?

What sign of the zodiac is represented by an archer?

What is the stage name of Gordon Matthew Thomas Sumner?

In Disney's "The Jungle Book', what kind of animal is Mowgli raised by?

Based on total pop chart success, what woman was named "Artist of the Decade" for the 1990's by Billboard magazine?

Who played Rodney Trotter in the TV series "Only Fools and Horses"?

What stadium hit do we owe to a pre-Civil War folk song and the Swedish dance band Rednex?

What British TV series featured Saffron and Bubble?

What President's Vice-Presidents were Aaron Burr and George Clinton, respectively?

In which present-day country is the site of the battle of Waterloo?