Does anyone know the name of this song?

Last night I saw the trailer for Harry Potter and the Deathly Hallows and I really liked the song in the last few seconds of the trailer. I know it’s probably too soon to get a response, but if anyone knows the name of the song would you please let me know what it is?

Thanks! I’d really appreciate it! :)

Here’s the trailer in which the song appears:

http://www.youtube.com/watch?v=9hXH0Ackz6w

The song starts at 1:40 but I think it’s the same song throughout the entire trailer.