As the audience filed back in, I began, cartoonishly, to envisage the fatal malady that, without anyone's recognizing it, was working away inside us, within each and every one of us: to visualize the blood vessels occluding under the baseball caps, the malignancies growing beneath the permed white hair, the organs misfiring, atrophying, shutting down, the hundreds of billions of murderous cells surreptitiously marching this entire audience toward the improbable disaster ahead. I couldn't stop myself. The stupendous decimation that is death sweeping us all away. Orchestra, audience, conductor, technicians, swallows, wrens - think of the numbers for Tanglewood alone just between now and the year 4000. Then multiply that times everything. The ceaseless perishing. What an idea! What maniac conceived it? And yet what a lovely day it is today, a gift of a day, a perfect day lacking nothing in a Massachusetts vacation spot that is itself as harmless and pretty as any on earth.