Where, song (for the film The Chronicles of Narnia: The Lion, the Witch

On this half lit day With your crown beneath your wing Every word just echoes And the empty world sings Where have you gone My feather light heart? I never imagined I could leave In the glistening Of the lost and open sky Tiny piece of you sits Simple wish waits for reply Where have you gone My feather light heart? You mustn't forget what love can see