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The brothers began performing together in 1954 , patterning themselves after groups such as Billy Ward and His Dominoes and The Dixie Hummingbirds .
 Billy Ward and His Dominoes, The Dixie Hummingbirds
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Billy Ward and His Dominoes, The Dixie Hummingbirds