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: STAGE NAMES 
Clue: Riley is the first name of this guitarist whose stage initials stand for "Blues Boy"

SOLUTION: b.b. king

PROBLEM: Category: OF OUTRAGEOUS FORTUNE 
Clue: In August 2009 the sultan of this spent $21,000 to get a trim from his favorite hairdresser

SOLUTION: brunei

PROBLEM: Category: "B" PREPARED 
Clue: This "colorful" variety of country music is played on unamplified stringed instruments

SOLUTION:
bluegrass