Rapper Kool Mo Dee thrived during hip-hop's nascent years as a vocalist whose tongue-twisting rhymes and speedy delivery put his counterparts to shame. On his 1987 album, How Ya Like Me Now, Kool came up with a `hip-hop report card': a method of rating MCs (Emcees, Masters of Ceremonies, Master Communicators, or rap vocalists) as a way of separating the premier MCs from their often one-dimensional, overrated counterparts ("Sucka MCs"). Building on this original list, Kool has put together an extensive rating system to compile the definitive list of the greatest MCs of all time. Kool rates each MC based on seventeen different categories, ranging from the artist's lyricism, vocabulary, and freestyling ability to his longevity, body of work, and social impact. Each artist is given a numerical score from one to ten in each of the seventeen categories, as well as an explanation for how this rating was determined. The book includes a complete discography and full-color photograph for each MC, and will also have supplemental lists, such as the top ten storytellers and top ten rhymers.