Outkast reunited onstage after a near decadelong hiatus with a jam-packed set at the Coachella music festival, their first of many performances planned this year.The rap duo headlined the first night of the music festival Friday in Indio, Calif., performing well-known hits such as “Hey Ya!,” ”Ms. Jackson,” ”The Way You Move,” ”Elevators (Me & You),” and “So Fresh, So Clean.”The Grammy winners performed two dozen tracks – seen via its livestream on YouTube – as they celebrated 20 years in music since the release of their 1994 debut, “Southernplayalisticadillacmuzik.””Hey Coachella, are y’all alive?” Andre 3000 asked the crowd at the top of their set. “Are y’all alive? Are y’all alive?””I really appreciate y’all coming out,” he said at the end of the performance, more than 90 minutes later. “I know it’s kind of weird 20 years later.”Outkast worked the stage as they performed their rap anthems, and at times, they performed around a small table with two chairs, an ode to their earlier years where they would write songs in Big Boi’s aunt’s kitchen in Atlanta and recite their lyrics in circles.”We just want to know one thing – are you having a good time?” Big Boi asked the crowd.