Problem and IamSu! are two of the most promising up and comers in the world of California "function music" and were big parts of two of the biggest rap records of 2012 (E40's "Function" and Loverance's "Up"). Though from wildly different regions sonically (Problem is from Compton and Iamsu!, the Bay) they sound more like members of a group than solo stars looking to up their profile on their collab tape, MIllion Dollar Afro.
Download: Problem and IamSu!, Million Dollar Afro