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The only actor in the cast who also sang his role was the celebrated Italian baritone , Tito Gobbi , but the film is largely very faithful to its source material , presenting the opera nearly complete .
 Tito Gobbi
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tito Gobbi