easier to do that in the nontwitter age. enough of the real news, let's gather around the water cooler to talk about a once in a lifetime moment in rock and roll history. sir paul mccartney joined the boss, bruce springsteen on stage sunday night in london's hyde park. the only problem, their mikes were cut out by concert organizers before they were done. are you kidding me? nbc's duncan golasani has the full report pulitzer journalism right here. ♪ two, three, four >> reporter: two music legends, one one incredible finale. until that is, someone cut the microphones. springsteen's good-bye silent to the crowd. and just left the sound of booing. among the 65,000 fans, was nbc's kier simmons. >> they didn't seem to know what was going on, you've got