hottest rock 'n' roll band in the world. their last album "the joshua tree" has so far sold more than 13 million copies worldwide. >> u2 somehow in the video age were still developing and become a great band and maintaining that kind of connection with people and not getting the message lost in the medium. >> we spent the last ten years finding out how to be in u2. we'll spend the next ten years seeing what u2 can do. ♪ i feel most times we're high and low ♪ ♪ high and low