More jamming for rock 'n' roll royalty at Garden (AP)

— with them onstage Friday at another night of mix and match magic at Madison Square Garden .

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During U2's set, Bono was waxing poetic about the spiritual, physical and political power of rock 'n' roll until finally the Boss had had enough. "Let's have some fun with it," Springsteen said. They performed U2's " I Still Haven't Found What I'm Looking For ," with Bono and Springsteen trading call-and-response vocals during the final verse.

Full Story: More jamming for rock 'n' roll royalty at Garden (AP)