Thirty Years of U2

U2 Rocks the World Thirty years since emerging from Dublin, the Irish rockers return with No Line on the Horizon, their first release in almost five years
Aaron Rapoport / Corbis

Aware
Early on, U2 established its interest in politics and social issues. An early hit, "Sunday, Bloody Sunday," carried a message of peace for Northern Ireland, while Bono and Clayton collaborated with Bob Geldof on "Do They Know It's Christmas," a hit that called attention to Ethiopian famine relief.

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