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: JOIN THE TEAM 
Clue: Played inside a gym or out on the beach, you have to know how to bump, set & serve to play it
volleyball

Category: SINGING ACTORS 
Clue: In 2001 this Oscar winner sang "Angelina", a romantic tribute to his fifth wife, on his album "Private Radio"
billy bob thornton

Category: TRANSPORTATION 
Clue: Nonrigid airships, like the ones used for advertising, are more commonly called this

blimps