NEW YORK (AP) - Musicians were so anxious to help out residents of the New York region hit by Superstorm Sandy, they almost didn't let their concert at Madison Square Garden end. The final notes of Alicia Keys' "Empire State of Mind" brought the star-filled show to an end at 1:19 a.m. Thursday, nearly six hours after Bruce Springsteen opened it. Paul McCartney's set found him playing the role of Kurt Cobain in a Nirvana reunion, performing a new song with that band's former members Dave Grohl and Krist Novoselic. Through television, live streams, the radio and theater simulcasts, an estimated 2 billion people around the world were given the chance to experience it live. Heavy on classic rock royalty, it also featured the Rolling Stones, the Who, Roger Waters and Eric Clapton.