NME reports that The Killers have enlisted Lou Reed to sing on the band's new track "Tranquilize." The song, which is set to appear on The Killers' upcoming B-sides-and-rarities album, is "a rollercoaster," according to leader Brandon Flowers, who will duet with Reed. "The song was calling for a duet, and his voice was just right," Flowers elaborates. "There's a desperation to it. It's one of our more depressing songs, but there's always a light at the end of the tunnel."