U2start liveshow: Zooropa at Wembley (9 July)

"I was telling Bono: 'We can’t overrehearse. Otherwise, we won’t make any mistakes.' And mistakes are a big part of what people love about U2. There’s still this element of jeopardy. You’re not going to see a band that’s so polished, where every night is a repetition of the previous night. We’re up there and we’re giving it everything we have." - Edge, 2008