Big Boi has always taken risks. As half of Outkast, he snapped and trapped his way through one of hip-hop's freakiest discographies, even rapping over marching-band drums and brass on “Morris Brown.” Since 2003, the ATLien has kept playing with oddball tendencies on his solo cuts. “General Patton” blends a Gatling gun-like flow with eerie opera choirs and brash horns, and “Shutterbugg” fuses Zapp-style digitized vocals with strange, stuttering beats. On “In the A” he goes old-school, trading boasts with T.I. and Ludacris over dense orchestral stabs and relentless hi-hats.