To call Eminem hip-hop's Elvis is correct to a degree, but it's largely inaccurate. Certainly, Eminem was the first white rapper since the Beastie Boys to garner both sales and critical respect, but his impact exceeded this confining distinction. On sheer verbal skills, Eminem was one of the greatest MCs of his generation — rapid, fluid, dexterous, and unpredictable, as capable of pulling off long-form narrative as he was delivering a withering aside — and thanks to his mentor Dr. Dre,...