Planet Earth Promo

Does anybody know the name of the music used on the Planet Earth promotions?

Thanks

Hoppípolla by Sigur Rós
Video here on YouTube

They also used this piece of music, at the end of this year's Children In Need Telephon show on BBC1 , 17/11/06. I quite like the song, with the words, and the initial music leaping into the song throughout.

Thanks a lot!