Last Friday evening dusked warm and sensuous—a rarity in this city. And at the San Francisco Symphony: one of those electric occasions to match, where everything comes together with inspiration, and the audience goes away feeling alive and happy. I don't think I have ever seen Michael Tilson Thomas so rested and intuitively joyous at the podium—American music is his specialty—and nobody since Bernstein does it so well. Thomas has a reputation for programming what amounts to narrated musical lesson-plans. Let him grab a microphone, and the dowagers in the audience get nervous.