What is the song that plays In The Chronicles of Narnia: Lion, Witch, and the Wardrobe. Its goes "One day..."?

its in the beginning scene and i believe other parts of the movie, too, but prominent in the beginning. I at first thought it was Enya, for the voice was so serene. But she does have a song that goes "One day, one night" but its much different. So, please find me the name of the song and artist and does it goes "One day, One day" repeatedly.