The Killers are teaming up with Boardwalk Empire.The Killers are providing the music for the new trailer for the final season of HBO's "Boardwalk Empire." In addition to shots of star Steve Buscemi and other Prohibition-era gangsters, the clip features the Las Vegas rockers' song "Tranquilize." The track is a collaboration with Lou Reed taken from the Killers' 2007 B-sides and rarities collection "Sawdust." The fifth season of "Boardwalk Empire" is scheduled to start September 7th.