White Stripes frontman has reportedly finished collaborating on his first hip-hop record, an upcoming release from Detroit rapper MC Black Milk.  In a post on his website, Black Milk says that White called and told him he wanted to collaborate, and he flew out to Nashville to record the record.  The two then got onstage together, and the concert was recorded and will be released on White's Third Man Records.  Two albums from Black's set, "Brain" and "Royal Mega," are already available for download from iTunes, as well as on a 7-inch record from the Third Man Records website.