The aura of a special day added to the enchantment of a special place, beautiful Bryant Park in Manhattan. The weather was made to order, unseasonably cool, and a few thousand people--most of them visiting gawkers like me--adorned the grassy pallet of green. Soon, theirs would be a chorus of screams that only teenagers can make when rock star idols, uh, well, rock! Invigorated by a brisk four-block walk from the hotel, I wilted upon seeing this sea of youthful humanity, quiet--ever so qui ...