BONO revealed how he had to talk himself into U2's first gig after recovering from a serious spinal operation.
The lead singer, pictured today in relaxed mode with Russian President Dmitry Medvedev ahead of tonight's Moscow concert, revealed he had been extremely anxious about his performance in Turin, Italy a few weeks ago.
Bono, who spent six weeks in hospital when he suffered a slipped disc, was unsure that he would be able to perform to the best of his ability.
"I woke up on the morning of the show with a certain anxiety -- Can I hit those notes? Have I got it inside of me?" he said.
"Have we got what it takes to make this experience one that people will remember for the rest of their lives?
"Or is it going to be four over-rewarded musicians playing in a football stadium?"
But he said Larry Mullen gave him a standing ovation for taking to the stage after such a traumatic time.
"I was very nervous -- very, very nervous," he revealed to Rolling Stone magazine.
"We had done a rehearsal two nights previous. And I was okay. I got through it," he added.