The Irish band's performance was the first halftime show after the Sept. 11, 2001, and the performance included large backdrops onto which were projected the names of many of the victims who died in the attacks. After the band performed "MLK," "Beautiful Day" and "Where the Streets Have No Name," frontman Bono revealed an American flag on the lining of his jacket. Many called it a stirring and respectful tribute.

Amy Sancetta/AP