What is the song from the Earth movie commercial when the duck is falling out of a tree?

Amanda C: What is the song from the Earth movie commercial when the duck is falling out of a tree?
I think the song goes like this “Im on top of the world and Im not looking down”. Please Help I love that song and I want to know the song or artist! Thank you!

Answers and Views:

Answer by Katherine
Hoppípolla by Sigur Ross