Combining the party-oriented snap music of Atlanta with the harder underground styles of Chicago and his native Mississippi, Soulja Boy conceived an uncomplicated sound he called "Shylantasippi" and greatly profited from it with "Crank That (Soulja Boy)." The single topped the pop chart in 2007, received multiple platinum certifications, and was up for a Grammy (Best Rap Song). After a three-album period with Interscope that generated additional crossover hits like "Kiss Me Thru the Phone," "Turn My Swag On," and "Pretty Boy Swag" through 2010, the rapper and producer returned...