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The Dixie Nightingales , also known as Ollie & the Nightingales and The Nightingales , was an African-American male vocal group , whose repertoire included gospel and later rhythm and blues and soul music .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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