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The myths , however , continued to provide an important source of raw material for dramatists , including those who wrote the libretti for Handel 's operas " Admeto " and " Semele " , Mozart 's " Idomeneo " , and Gluck 's " Iphigénie en Aulide " .
 Handel, Mozart, Gluck
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Handel, Mozart, Gluck