“[T]he setbacks endured by our museums and performing arts companies have generally been less severe than those suffered by their counterparts in the United States, where an atonal symphony of shrinking endowment funds, belt-tightening philanthropy and declining attendance have created a climate of retrenchment. Closer to home, the good news is that the major players have all survived. The bad news is that many of them have been wounded and weakened in ways that could make it hard for them to operate at peak level for years to come.”