All About Christmas Carols

Historically, a "carol" is a song or dance of praise or joy. They used to be performed during all four seasons. Today, most young readers know the carols many people sing at Christmastime, including "Oh, Christmas Tree" and "Jolly Old St. Nicholas." Entire radio stations will marathon-play these tunes during December. Where did the tradition for these songs begin? How are they used around the worl...