By DAVID BAUDER U2 brought three generations of chart-toppers - Mick Jagger, Bruce Springsteen and the Black Eyed Peas - with them onstage Friday at another night of mix and match magic at Madison Square Garden.Metallica brought the thunder to Lou Reed and Ray Davies. It was the second of two concerts to celebrate the 25th anniversary of the Rock and Roll Hall of Fame, and they will be edited into an HBO special to be seen on Thanksgiving weekend.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.