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He was also one of the guest musicians in Avantasia 's 2010 world tour , which have put him to play live together with fellow ex-bandmate Michael Kiske , after more than twenty years since he left Helloween .
 Avantasia, Michael Kiske, Helloween
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Avantasia, Michael Kiske, Helloween