Robertson, a distinguished conductor of Boulez's Ensemble
InterContemporain, is largely associated with modern music, although I have
read several excellent reviews of operas he has conducted as well as (IIRC)
a stellar critique of a concert of Brahms and Schoenberg.  On a personal
level, he led a magnificent concert this summer at Tanglewood, including
Claude Vivier's magnificent 'Siddhartha', and there was a universal appeal
throughout the orchestra--nobody has ever conducted more clearly and made
more sense, emotionally and technically, out of such a complex and quirky
score.  I also got a chance to talk with him for a little while and he
seemed very personable.  Philly would be lucky to have him--what a great
complement to Spano, were he to get Boston.

Cheers,

Marcus Maroney
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http://www.geocities.com/marcus.maroney