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Staff that worked on the recording began to compare Kobayashi 's voice to that of Karen Carpenter , lead singer of The Carpenters , and suggested she approach Richard Carpenter .
 Kobayashi, Karen Carpenter, Richard Carpenter
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kobayashi, Karen Carpenter, Richard Carpenter