Before revision: Some popular Christmas carols are "We Wish You a Merry Christmas", "Deck the Halls", "The Twelve Days of Christmas", "Frosty the Snowman", "Jingle Bells", "Silver Bells", "Santa Claus Is Coming to Town", and "O Holy Night".
After revision: Some popular Christmas carols are "We Wish You a Merry Christmas", "Deck the Halls", "The Twelve Days of Christmas", "Frosty the Snowman", "Jingle Bells", "Silver Bells", "Santa Claus Is Comin' to Town", and "O Holy Night".