Where can i find the song in the terminator salvation trailer?

I know the song is "The Day The World Went Away" By Nine Inch Nails, but i want the version they used in the trailer. They have a few versions of the song, but i want the drum version, the one they used in the trailer. I looked all over limewire, itunes, everything, but i cant find anything that will let me get it on my ipod. please help