Bruce Springsteen and Paul McCartney were in the midst of making rock history Saturday night in London’s Hyde Park when their set was cut short by promoters in fear of curfew violation.

The Boss pulled the former Beatle on stage during his headlining set at the Hard Rock Calling Festival, saying, “I gotta tell you – I’ve been trying to do this for 50 years.”

The duo, backed by the E Street Band and Rage Against the Machine guitarist Tom Morello, launched into The Beatles’ “I Saw Her Standing There,” then an extended version of “Twist and Shout.” Their once-in-a-lifetime collaboration came to an end, though, when the stage fell silent around 10:40 p.m. local time.  Sources report the official curfew for the event was 10:30 p.m.

The 76,000-person crowd reportedly booed when the legends’ mics were cut off.

E Street Band guitarist Steven Van Zandt took to twitter to share his thoughts on the situation:

English cops may be the only individuals left on earth that wouldn’t want to hear one more from Bruce Springsteen and Paul McCartney!

— Steven Van Zandt (@StevieVanZandt) July 15, 2012

“One of the great gigs ever in my opinion,” he also tweeted Saturday after the show. “But seriously, when did England become a police state? We break curfews in every country but only English cops needs to “punish us” by not letting us leave until the entire crowd goes. Is there just too much fun in the world? We would have been off by 11 if we’d done one more. On a Saturday night! Who were we disturbing? The cops got nothing more important to do? How about they go catch some criminals instead of f***ing with 80,000 people having a good time? I’m sorry but I have to be honest I’m pissed. Like I said, it didn’t ruin the great night. But when I’m jamming with McCartney don’t bug me!”

Check out video of Saturday night’s set here.

-Nee-Sa Lossing, CBS Local