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Later , he was featured on over 10 songs on Avantasia 's two subsequent albums , " The Wicked Symphony " and " Angel of Babylon " and once again took part in the world tour in December 2010 .
 organization: Avantasia
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Avantasia