They saw a star in the east - a Christmas rebus

Deck the 

with boughs of 

Fa-la-la-la-la, la la, la la. 

Tis the season to be 

Fa-la-la-la-la, la la, la la. 

Don we now ourapparel

Fa-la-la-la-la, la la, la la. 

the ancient 

-tide carol,

Fa-la-la-la-la, la la, la la. 

Note: This took way more time than it was worth but I got the idea in my head and just had to run with it. Apologies to anyone offended by this silliness.