U2 postpones tour, Aguilera delays summer dates: Aidin Vaziri | U2 has postponed all the dates on this year’s “360°” world tour, including a June 16 concert at the Oakland Coliseum, after lead singer Bono injured his back during rehearsals in Munich and underwent emergency surgery. “In order to fully recover, he is under doctor’s orders to start a rehabilitation program and to recuperate for at least eight weeks,” a statement from tour promoter Live Nation said. Fans are encouraged to hold onto their tickets for the reschedule tour dates, which will be announced in the near future. U2’s manager, Paul McGuinness, added, “For a performer who lives to be onstage, this is more than a blow. He feels robbed of the chance to do what he does best and feels like he has badly let down the band and their audience.” Meanwhile, Christina Aguilera has also postponed her summer tour dates, according to Live Nation, because of “prior commitments.” The singer is reportedly working on a movie called “Burlesque.” New dates will be announced later this year. Refunds for her Aug. 18 concert at Shoreline Amphitheatre are available at point of purchase. Read more.