"This is a new song we're trying out," Bono said in Frankfurt, Germany, in August 2010. "It's kind of a rocking 1970s thing. It's called 'Glastonbury.'" U2 were supposed to play England's massive Glastonbury festival that summer, but Bono's back problems delayed the show until the following year. When he got better, they debuted this rocking tune when they played mainland Europe in the late summer. Oddly enough, they didn't bust it out when they were actually at Glastonbury.