Vladimir Ashkenazy is a beloved figure in Sydney, one immediately realizes, as he dashes onstage in a signature white turtleneck to lead the Sydney Symphony at the Opera House concert hall. You'd never guess this compact Conductor Laureate, with his full shock of white hair and healthy build is 82 years old. Subtract twenty and you might be closer to the truth. A phalanx of teenage girls in striped school uniforms immediately starts screaming and doesn't let up. As the evening progresses, not entirely aware of when to burst into applause, they will several times bring the proceedings to a momentary halt born of green but great enthusiasm and delight. No musician, of course, genuinely minds that sort of excitement.