St Francis of Assisi introduced Christmas Carols to formal church services.
The word comes from the ancient Greek choros, which means "dancing in a circle," and from the Old French word carole, meaning "a song to accompany dancing."
The first instrument on which the carol "Silent Night" was played was a guitar.
The popular Christmas song "Jingle Bells" was composed in 1857 by James Pierpont, and was originally called "One-Horse Open Sleigh." It was actually written for Thanksgiving, not Christmas.