You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: CANADIAN BAL-EH? 
Clue: Alberta Ballet's "The Fiddle and the Drum" is set to the songs of this female singer born in Alberta
joni mitchell

Category: 20TH CENTURY AMERICA 
Clue: On April 6, 1917 America entered World War I & this composer wrote "Over There"
george m. cohan

Category: THE WINTER PALACE 
Clue: In 1881 the "Czar Liberator", the II czar of this name, asked to be taken to the palace to die after being fatally wounded

alexander ii