I'm sure there are tons of these out there, but I wanted to contribute a little something, myself :) I hope you enjoy it.
http://www.youtube.com/watch?v=krhvxGE7fHM
Musical credits are in the info box, but I'll restate them here:
"We Remember" - Everyone's favorite composer Marty, but I'm sure everyone here knows this :)
"Stay" - Poets of the Fall. I just felt the song fit both the feelings in the game and how I feel about Bungie. Not that..Bungie is leaving...but y'know.
[Edited on 11.09.2010 9:47 PM PST]