Kristen Rajczak Nelson 
Todo sobre los villancicos (All About Christmas Carols) [PDF ebook] 

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 world? Beginning readers find out these facts and more within the pages of this festive volume.