By John Frederick Coots and Haven Gillespie.

Listen on YouTube.

Read artist commentary.

Lyrics:

I've just come back from a lovely trip
Along the Milky Way
I stopped off at the North Pole
To spend the holiday

I called on dear old Santa Claus
To see what I could see
He took me to his workshop
And told his plan to me

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

He's making a list
Checking it twice
Gonna find out who's naughty or nice
Santa Claus is comin' to town

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

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

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

Artist commentary:

Niklink: (wiki editor)

The lyrics may be a little different to what you're used to, but they correspond to the first recording of this carol by Harry Reser.

Quasar Nebula: (wiki editor)

For a very long time, listed as referenced during the introduction of Gog Rest Ye Merry Prospitians; this appears to be Here Comes Santa Claus instead.