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 simplicity, answers should be in all lower cased letters.
PROBLEM: Category: MUSICAL INSPIRATIONS 
Clue: The libretto for Haydn's oratorio "The Creation" was based on this epic English poem

SOLUTION: paradise lost

PROBLEM: Category: U.S. PRESIDENTS 
Clue: Washington was the one who added these 4 words to the presidential oath; they're not in the Constitution

SOLUTION: \"so help me god\"

PROBLEM: Category: THE SOLAR SYSTEM 
Clue: Objects that pass closer to the sun than Mercury have been named for this mythological figure

SOLUTION:
icarus