Question: "Treehouse of Horror" is the third episode of "The Simpsons"' which number season, and is the first episode to have the music composed by Alf Clausen, an American film and television composer?
Sentence (from "Alf Clausen"): Alf Heiberg Clausen (born March 28, 1941) is an American film and television composer.
Relevant evidence: Yes