Carnegie Hall's 100th birthday celebration Sunday was a class act. Retired diva Beverly Sills and ABC anchorman Peter Jennings were the hosts, and the daylong festivities featured violin virtuosos Isaac Stern and Pichas Zuckerman, cellists Mstislav Rostropovich and Yo-Yo Ma, opera stars Placido Domingo, Jessye Norman and Kathleen Battle, actor Anthony Quinn, choreographer Agnes DeMille, conductor Zubin Mehta, director Mike Nichols and Liza Minnelli. "This is the place for the best to be the best," said Minnelli, whose 1987 concert series set a Carnegie Hall box office record. Stern, who oversaw the fabled hall's recent $80 million renovation, said, "Carnegie Hall represents a striving for beauty and the great power of music to touch the soul. Its mission is to give wings to new artists, to youngsters, while never forgetting where music came from."