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: CLASSICAL MUSIC 
Clue: Mendelssohn's "Songs without Words" were once the most popular pieces for this instrument

SOLUTION: piano

PROBLEM: Category: AUTHORS 
Clue: This "Oz" author was urged to write his stories by his mother-in-law, noted suffragette Matilda Gage

SOLUTION: baum

PROBLEM: Category: CLEO 
Clue: In 31 B.C. a huge Roman fleet led by Augustus & Agrippa defeated the fleets of Cleopatra & this man at Actium

SOLUTION:
mark antony