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Tschaikovsky Piano Concerto No. 2 is a ballet made by New York City Ballet 's co-founder and founding choreographer George Balanchine on his earlier company , American Ballet Caravan to eponymous music from 1879 – 80 .
 Ballet, George Balanchine, American Ballet Caravan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
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Answer:
 Ballet, George Balanchine, American Ballet Caravan