This is my favorite, the Huron Carol, a traditional Canadian carol. I learned it as a child at school, and have always loved its beautiful melody (no, my parents did not know I was singing it at school hehe)
The "Huron Carol" (or "'Twas in the Moon of Wintertime") is a Christmas hymn, written in 1643 by Jean de Brébeuf, a Christian missionary at Sainte-Marie among the Hurons in Canada. Brébeuf wrote the lyrics in the native language of the Huron/Wendat people; the song's original Huron title is "Jesous Ahatonhia" ("Jesus, he is born"). The song's melody is a traditional French folk song, "Une Jeune Pucelle" ("A Young Maid"). The well known English lyrics were written in 1926 by Jesse Edgar Middleton.
https://www.youtube.com/watch?v=3DtOqcFBQqk
Merry Xmas!
Here's my second favorite, very modern. Christmas in Hollis by Run DMC ,,,,,,,, get your groove on! : D