The U2 frontman has long juggled a dual career of rock superstar and high-profile campaigner, badgering world leaders and businessmen to fight everything from AIDS to poverty.

There are those who feel his mission is beginning to hinder the harmony, alienating potential fans and colouring everything that U2 does. "It's becoming increasingly difficult to hear U2's music without filtering it through your feelings about the other Bono, that strident, sanctimonious swirl of idealism, agenda and ego," J. Freedom du Lac wrote in the Washington Post. - more on this story

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