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: "E" BAY 
Clue: Thinking green, biologist Ernst Haeckel coined this term for the way animals interact with the environment
ecology

Category: MOZART & FRIENDS 
Clue: Mozart wrote a lovely motet for Venanzio Rauzzini, one of these specially treated singers
a castrato

Category: TASTY MUSICAL ACTS 
Clue: This "citrus" electronica band did music for 30 films in the '80s, including "Risky Business" & "Legend"

tangerine dream