Go Tell it on the Mountains.
It can be a hymn relating to Christmas or the name of a book by Charles Dickens.
The term 'christmas carol' means joyful religious song celebrating the birth of Christ
Nuts in a Christmas Carol means to act crazy or bizzarly. It also can mean the food kind of nuts.
Generally it means a group of people singing (or carolling) Christmas songs
They used Charles Dickens book and 3-D animation.