(See Corrections and Amplifications item below.)  'War and
Peace' at the Four Seasons Centre in Toronto. Clive Barda  In
Vienna this past June, I went to a thrilling production of
Richard Strauss's "Capriccio." The next morning, in a 14th-
century Gothic church, I was swept away by the reverberant
beauty of a performance of a rarely heard Haydn mass. Both the
opera house and church were filled to maximum capacity. The
depth of the sound, its material sensuality and the allure of
great music that has not been overplayed lent each listener an
intimate sense of the human imagination that could be shared
with hundreds of anonymous companions.  Nothing can reproduce
the sonic and emotional power of live performance. But looking
out at the audience at most classical music concerts in the
United States, one sees a crowd that is largely middle-aged,
verging on the geriatric. This has set off alarms within the
music community, whose members are quick to blame the loss of a
younger generation of listeners for the sorry