This year there's a lot of Pentatonix and Straight No Chaser on my playlist.

Mary, Did You Know?
Breath of Heaven (Mary's Song)
Lully Lullay
We Three Kinds
Leontovych: Carol of the Bells
O Come, All Ye Faithful
God Rest Ye Merry Gentlemen
Noel
Where Are You Christmas
New Kid in Town