Dan Fogelberg's 1999 album "The First Christmas Morning" has several traditional and/or well-known Christmas songs - including one of the most beautiful versions of "This Endris Night" that I've ever heard.   It also includes 5 or 6 new compositions by Dan, most of them with a decidedly "trad" or "old" (e.g., Renaissance or 19th C) feel to them.

I've posted lyrics and links to sound clips here:
   Dan Fogelberg: Christ The King
Dan Fogelberg: At Christmas Time
Dan Fogelberg: The First Christmas Morning

Clips from all the songs on the album, as well as lyrics to the ones that have lyrics, are here: Dan Fogelberg album: The First Christmas Morning