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In 2011 , Yamaha Artist Services , Nashville became a part of Yamaha Entertainment Group ( YEG ) , and Chris Gero became the Vice President of YEG .
 Yamaha, Yamaha, Chris Gero
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Yamaha, Yamaha, Chris Gero