"Sunshine" trailer music

I previously posted the trailer for Sunshine, the new film from Danny Boyle. This trailer was being played every 10 minutes at the Fox Atomic booth at WWLA so I heard it a lot yesterday. The music is unbelievable and has been stuck in my head ever since WWLA, so I went on a hunt for the song.

Turns out the orignal version of this tune was in Requiem for a Dream (a movie I hated. Yeah, that's right. Get over it). Then it weas apparently remixed/re-recorded for the Lord of the Rings: The Two Towers trailer. Well, after all that, I found it in the iTunes Store. Specifically, it's "Movement 4" from "Requiem for a Tower" (obviously).

Link to the track on iTunes.