The Black Keys have always possessed a finer understanding of R&B and funk grooves than just about any other indie-dipped retro-rock act out there. Label CEO and producer Damon Dash apparently thinks so, too. He's the mastermind behind pairing up the duo's psych-blues boogie and a who's who of rapper delights, including Mos Def, Raekwon and RZA. But the Keys are more than just a rhythm section. On "Ain't Nothing Like You (Hoochie Coo)" guitarist Dan Auerbach shares vox duties with Mos Def.