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She may be best-remembered for creating roles in the world premieres of two opera s by Gian Carlo Menotti : the title role in Amelia Goes to the Ball ( 1 April 1937 at the Philadelphia Academy of Music ) and Laetitia in The Old Maid and the Thief ( on NBC Radio on April 22 , 1939 ) .
 Gian Carlo Menotti
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Gian Carlo Menotti