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While punk rock band the Ramones used " The Ecstasy of Gold " as closing theme during their live performances , Metallica uses " The Ecstasy of Gold " as the introductory music for its concerts since 1983 .
 Ramones, Metallica
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ramones, Metallica