This one's not very good but I'm posting it anyway. From Sauron's point of view.

Deck the Halls:

Deck my halls with rings of power!

Fa la la la la la la la laaaaaa!

I don't care for frills or flowers!

Fa la la la la la la la laaaaaa!

Follow me in evil measure!

Fa la la la la la la la laaaaaa!

As I search for "precious" treasure!

Fa la la la la la la la laaaaaa!