She was a principal dancer at New York City Ballet from 1955 to 1973 , and George Balanchine choreographed leading roles for her in over 20 of his ballets , including such masterpieces as Agon , Liebeslieder Walzer , A Midsummer Night 's Dream , and Stars and Stripes .
George Balanchine /business/person/company New York City Ballet
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George Balanchine
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New York City Ballet
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