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Over 100 million albums and twenty two years since their formation at Dublin's Mount Temple High School in 1978 - at the instigation of Larry Mullen who pinned an ad to the bulletin board - there's little denying that U2 have cemented their reputation among the greatest rock acts in history. Two decades on they remain intact. No-one has ever left U2, no new member has ever joined. Together they have shared an extraordinary career thus far.