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History The American Opera Society was founded in 1950 by two young musicians at the Juilliard School : Allen Sven Oxenburg and Arnold Gamson .
 Opera, Juilliard School, Allen Sven Oxenburg, Arnold Gamson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Opera, Juilliard School, Allen Sven Oxenburg, Arnold Gamson