The Black Keys team up with RZA on 'The Baddest Man Alive,' the lead track off the soundtrack to the forthcoming Quentin Tarantino-produced flick 'The Man With the Iron Fists.' The Keys are the rare rock act on an album full of hip-hop and rap stars -- including members of the Wu-Tang Clan, who appear in various combinations on several cuts and as a unit on the second-to-last one, 'Six Directions of Boxing.'

Not surprisingly, 'Baddest Man' is a funky little number, with the Keys laying down a deep psych-blues groove for RZA to drop some freestyle verse -- about how much of a badass he is -- on top of. "I'll snatch food from the mouth of a tiger/ Take a gasoline bath then I walk through fire," he rhymes at one point, and things only take off from there. The soundtrack drops on Oct. 23, while 'The Man With the Iron Fists' hits screens on Nov. 3.