Question: Where did the song santa claus is coming to town come from?
Disambiguated questions and answers: question: Which show was the song santa claus is coming to town sung? 
Who wrote the song santa claus is coming to town? 
answer:  Eddie Cantor's radio show
 J. Fred Coots and Haven Gillespie
Natural Questions answer: Eddie Cantor 's radio show (from the Wikipedia article "Santa Claus Is Comin' to Town")