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: RODGERS & HAMMERSTEIN 
Clue: Mary Martin received a Tony Award for playing Maria in this 1959 Rodgers & Hammerstein musical

SOLUTION: the sound of music

PROBLEM: Category: NOVEL WEDDINGS 
Clue: Frankie Adams thinks that she'll get to accompany her brother on his honeymoon in this Carson McCullers novel

SOLUTION: member of the wedding

PROBLEM: Category: FICTIONAL CHARACTERS 
Clue: Lassiter is the gun-slinging hero of this Zane Grey novel & appears in its sequel "The Rainbow Trail"

SOLUTION:
"riders of the purple sage"