Replying to song in the Unity trailer

Does anybody know the name of the song in the Unity trailer? I know it's by Mos Def and Talib Kweli but does anyone know what it's called? I'd post the link for the trailer but I'm inept with computers so I don't know how. There is a link in the 'Teasers' thread if you haven't seen it, it's a sick trailer despite the fact that it's for a movie from a year or two ago

'You think you're too cool for school, but I've got a newsflash for you Walter Kronkite...You aren't' - Zoolander