Andre 3000 and Big Boi are getting back together. According to Billboard and several other industry sources, the legendary Atlanta hip-hop outfit OutKast is set to perform at this year’s Coachella music festival, two decades after their debut album Southernplayalisticadillacmuzik first dropped. The duo parted ways in 2006 to focus on solo careers and haven’t performed together in years. The Guardian is reporting that, following the Coachella performance, the pair may be planning to also hit the road for a 20th anniversary world tour …