It has to be able to play at the maximum expression and communication in every style, and the only way you can do that is - like Verdi said - working with a file, every day, little by little, until the orchestra's collective qualities emerge.
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About James Levine
James Levine was a 20th-century American conductor and pianist. James Lawrence Levine was an American conductor and pianist. He was music director of the Metropolitan Opera from 1976 to 2016, and wielded the baton for 2577 Met performances. Read more on Wikipedia →