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Its songs have sold over 17,081,000 digital copies , only behind from " The Fame Monster " ( 2009 ) by Lady Gaga and " The E.N. D " ( 2009 ) by The Black Eyed Peas .
 The Fame Monster, Lady Gaga, The E.N. D, The Black Eyed Peas
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 The Fame Monster, Lady Gaga, The E.N. D, The Black Eyed Peas