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The orchestrations in Gershwin 's symphonic works often seem similar to those of Ravel ; likewise , Ravel 's two piano concertos evince an influence of Gershwin .
 Gershwin, Ravel, Ravel, Gershwin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gershwin, Ravel, Ravel, Gershwin