Legend goes that Damon Dash heard The Black Keys and approached them to collaborate, and whilst in the studio with Jim Jones, Mos Def walked in. Then they got clearance to use some Ol' Dirty Bastard vocals from Def Jam, and since then everyone from Ludacris, Rza and Nicole Wray have been involved. The album is not perfect, some songs are a bit weak, but for the most part it works really well. The Black Keys lo-fi riffs add a great undertone for all the acts to sing/rap over. The basic blues/hip hop combinations are often killer though, especially on songs like 'Ain't Nothing Like You (Hoochie Coo)'. 'Blakroc' is a great album finishing off 2009, and I have the upmost respect for the artists involved. I just hope it inspires more cross genre collaborations of this calibre.