Coachella Lineup Announced: OutKast, Arcade Fire, and Muse to Headline Taylor Berman · 01/09/14 08:24AM The long-rumored OutKast reunion is official: The Atlanta duo will headline this April's Coachella Valley Music and Arts Festival along with the Arcade Fire and Muse. The festival's dates were also announced: April 11-13 and April 18-20.