"Zan With That Lean," last year's overjoyed, Auto-Tuned romp by chronic appropriator Soulja Boy and his then-muse Kwony Cash, could hardly sound farther from "Don't Like" and the gruff drill sound that first made Chief Keef famous. Then, somehow this spring, both improbably and obviously, Soulja Boy and Keef linked up—first on "Say She Luv Me," and a few times since. Now, on "Kush Wit Them Beans," Keef hops on "Zan With That Lean." Who would've thought it would come to this? And isn't it kind of great that it did?