Any good music for a Christmas Musical?

First of all, Me and my friend are putting on a play called "The True Meaning Of Christmas" It's about two little kids who are all excited for Christmas and saying how it's the best holiday of the year, only because of the presents! So the kids discover a bible from Santa Claus to teach the Children the true meaning of Christmas, Jesus's birth. So far in the beginning I'm thinking the small kids could we skipping home singing " Here We Come A Waling" " Then after other things, when he goes to bed, he will sing this song about Where is Santa Claus? Or something like that. Then he has a dream which is being acted out, the Nativity scene and reliezed how important it was after reading out of his bible, the dream goes wacky and wrong and the kids discover what Christmas is really about. Any more songs to fit into a play like that Please we haven't started rehearsing yet!