Bonnaroo 2015 Photo Diary: Mumford & Sons, My Morning Jacket, Slayer, Gary Clark Jr., Bleachers, Catfish and the Bottlemen, SZA, & Phox by Slant Staff June 15, 2015 Mumford & Sons, My Morning Jacket, Slayer, Gary Clark Jr., Bleachers, Catfish and the Bottlemen, SZA, & Phox.