Whenever Elsa uses her powers to call the snow you can hear Christine's high pitched singing. Some people think it's some kind of a magic flute, but she's only using the Scandinavian herding call technique called kulning or kauking. Christine is one of the few authentic herd callers in the world as she learned it while herding goats in the Norwegian mountains as a child.
In addition to the kulning
Christine was also asked to write lyrics
in ancient Norse
for the Coronation Scene; Heimr Árnadalr
which is sung by the choir. Norse is known as the language of the Vikings
and is now extinct.
The Original Score was written by film composer Christophe Beck.
The movie was directed by Jennifer Lee
and Chris Buck
and the songs were written by Kristen Anderson-Lopez
and Robert Lopez.