"Santa Claus is Coming to Town" was written by John Frederick Coots and Haven Gillespie. It was aired first on Eddie Cantor's radio show in 1934. It first became popular 40 years after its release.
"Santa Claus is coming to Town" was written because Haven Gillispie wanted to write a kids Christmas song, and John Frederick Coots agreed on this idea. Gillespie and Coots made millions off there hit song.
The movie version of this song is a musical of vocal talent. It includes Fred Astaire and Mickey Rooney. It explains of how Kris Kringle became Santa Claus, and how he became the most famous figure of Christmas.