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In 1911 , he joined the conducting staff at the Metropolitan Opera at the behest of Giulio Gatti-Casazza .
 organization: Metropolitan Opera; person: Giulio Gatti-Casazza
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Metropolitan Opera; person: Giulio Gatti-Casazza