Typically, more than half the top rap songs in the country are the work of Southern artists. In a world still stuck in the East/West coast paradigm of the '90s, Southern hip hop has dominated the genre-and defined the culture-for years. And the South's leading lights, most notably OutKast, Timbaland, and more recently, crunk superstars like the Ying Yang Twins and Lil Jon, have expanded the parameters of hip hop. Third Coast is the first book to deal...