Lead singer Bono (C) of Irish rock band U2 performs a concert at the Olympic stadium in Turin, northern Italy August 6, 2010. U2 singer Bono is ready to rock after back surgery sidelined him for two months, and forced the band to postpone its North American tour by a year to May 2011. The Irish rockers began the second European leg of their "360 Degree" world tour on Friday in Italy. [Xinhua]