“It’s hard to say which part of Frank Gehry’s Jay Pritzker Pavilion, opening Friday as the $50 million centerpiece of Chicago’s new Millennium Park, is the most striking. Is it the bandshell itself, with its 50-foot steel-and-glass doors that roll in and out from the sides? Is it the almost baroque proscenium… that frames the stage with a 120-foot-tall fantasia of billowing shapes clad in brushed stainless steel? Or is it the metal trellis that crisscrosses like a vast spider-web above the heads of the potentially 11,000-member audience? Whatever the answer, it’s clear that many people are happy with the combined result.”