http://www.eonline.com/news/330426/...mccartney-s-surprise-duet-cut-short-by-curfew Bruce Springsteen and Paul McCartney's Surprise Duet Cut Short by Curfew In this case, it was a Hyde Park freeze-out. Bruce Springsteen and the E Street Band pulled out all the stops for U.K. fans in London's famed green space on Saturday night during a gig at the Hard Rock Calling Festival when they invited fellow rock legend Paul McCartney to join them onstage for an encore of some Beatles tunes. Trouble is the Boss didn't bother to run it by promoters, who had a strict curfew to enforce. Telling the record crowd of 76,000 that he'd been waiting 50 years to do this, New Jersey's favorite son brought the former moptop up for a rollicking run through "I Saw Her Standing There" and "Twist and Shout." But alas, little did Springsteen realize that by then the show was blowing past its scheduled 10:30 p.m. end time. Consequently, according to the Guardian, just as he and McCartney were about to launch into yet another ditty, instead of letting the all-star jam play out, concert organizers shut it down entirely, cutting power to his microphone.