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A 1966 festival organized by Gene Tyranny , 12 Hours of the New Music included music by Kabza along with pieces by John Cage , Gordon Mumma and Robert Ashley .
 Gene Tyranny, John Cage, Gordon Mumma, Robert Ashley
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gene Tyranny, John Cage, Gordon Mumma, Robert Ashley