Eminem

Long dormant rapper Eminem, a.k.a. Marshall Mathers, may be dissatisfied with his new material, but according to a spokesperson, the rapper's long-awaited follow up to 2004's Encore could drop before year's end, Billboard.com reports.

Speaking on his Sirius satellite radio station, Shade 45, Eminem said he's currently producing artists signed to his Shady Records label as well as working on new material for himself. "I'm concentrating on my own stuff right now -- just banging out tracks," the Detroit native said. "The more I keep producing, the better it seems I get. I start knowing stuff, learning the boards like the back of my hands."