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: MONEY, MONEY, MONEY 
Clue: In 1970 this Japanese currency was at 360 to the dollar; today it's under 100
the yen

Category: PARTICLE PHYSICS 
Clue: To get an element's mass number, add its protons & these
neutrons

Category: MUSICAL TRIBUTES 
Clue: The Red House Painters recorded "Fly Away" for "Take Me Home", a CD tribute to this singer

john denver