Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.
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Question: Which American big band leader had as his theme song, the tune, I'm Getting Sentimental Over You?

Answer: tommy dorsey

Question: What TV show had the theme song I'll be there for you?

Answer: friends

Question: What was Girls Aloud's 2002 UK Christmas number one single?

Answer:
sound of the underground