On a Saturday night some 6,000 Moscow teenagers pack into the Luzhniki sports amphitheater, a warehouse-like hall that is usually the venue for hockey matches and basketball games. Off-duty soldiers, their pink faces fuzzy with adolescent stubble, scuffle to get closer to the stage, while packs of young girls giggle at their antics. It might be a concert anywhere in America -- except that no T shirts are for sale, no hot dog vendors trawl the aisles, and, most of all, no one smokes anything stronger than cigarettes.
Through 2 1/2 hours and ten opening bands, the kids have stood shoulder...