You better watch out, you better not cry
You better not pout, I'm telling you why
Santa Claus is comin' to town, gather all

He's making a list and checking it twice
He's gonna find out who's naughty and nice
Santa Claus is comin' to town

He sees you when you're sleepin'
He knows when you're awake
He knows if you've been bad or good
So be good for goodness sake

You better watch out, you better not cry
You better not pout, I'm telling you why
Santa Claus is comin' to town

By: John Frederick Coots and Haven Gillespie

Source

Origin: United States of America
First Published: 1934

https://en.wikipedia.org/wiki/Santa_Claus_Is_Comin%27_to_Town