I got plenty of reference material via Google after typing in Yuletide and a second search of Christmas Carols
Good hunting.

Try a look at ....
http://www.sanfords.net/Pagan_Humor_and_Thoughts/Pagan_Yule_songs.htm
....interesting!

And from....
http://www.carols.org.uk/
.... straight away.....

Deck the Halls : Lyrics
Deck the halls with boughs of holly,
Fa la la la la, la la la la.
Tis the season to be jolly,
Fa la la la la, la la la la.

Don we now our gay apparel,
Fa la la, la la la, la la la.
Troll the ancient Yule tide carol,
Fa la la la la, la la la la.          etc etc

All the best - Duncan