My absolute favorite Christmas hymn is 'O Holy Night'. My favorite Christmas carol is 'Carol of the Bells'. :o) Could listen to them both over and over.
A have several favorites..Mary did you know is one, Little Drummer Boy, and o Come all ye faithful.
I love them all, really. But I really love listening to Mannheim Steamroller while relaxing.
O Holy Night sung by Celine Dion. (I am not particularly a Celine fan, but I love the way she sings this song!)