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For the purpose of the opera Farinelli becomes a tenor ; at the premiere the role was taken by the composer and singer Michael William Balfe .
 Farinelli, Michael William Balfe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Farinelli, Michael William Balfe