Bono and his back are back! U2 will perform at the Glastonbury music festival this year, joining Coldplay and Beyoncé as the main headline acts.  The band had to cancel their scheduled appearance at one of the world's biggest outdoor music events last year when lead singer Bono injured his back. Bono and his back are back!   U2 will play the Pyramid stage, which can be seen by tens of thousands of fans standing on a grassy slope, on Friday, June 24th.