TASK DEFINITION: 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 consistency, answers should be in all lower cased letters.
PROBLEM: Category: PLANE CRAZY 
Clue: On August 6, 1945 this B-29 airplane became the first to drop an atomic bomb in warfare

SOLUTION: the enola gay

PROBLEM: Category: BELGIUM, BELARUS OR BELIZE 
Clue: It's part of the British Commonwealth of Nations

SOLUTION: belize

PROBLEM: Category: MUSICMAKERS 
Clue: Yes, Sir!  His 2002 "Back in the U.S." tour was named Tour of the Year by Billboard Magazine

SOLUTION:
paul mccartney