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A few months later , Svetlev began a 3-year contract with the Gärtnerplatztheater in Munich , where he sang the leading opera tenor roles and operettas .
 Gärtnerplatztheater
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gärtnerplatztheater