A Christmasy Musical advent Calendar Thingy 15

There has been some debate (in my head at least) as to whether this CMACT has any design to it or not.

Is there secret meaning, theme, timing, build or rhythm?

Any idea at all in fact?

Well, let me tell you that today's ditty is carefully inserted;

a) to get the word Christmas featuring a bit more
b) to have a picture of a Christmas Tree because mine is up and lit at last.
c) i fancy some chestnuts.
d) i wanted to avoid The Chieftans getting two slots this year.

So there.

Plus it's pretty standard on most people's CMACT lists so i wanted to get it out of the way early.