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He has complimented his studies in the summer courses of Savonlinna ( 1987 ) and Kangasniemi ( 1988 ) , at the Vienna State Opera studio ( 1990 – 1991 ) , the Konservatorium der Stadt Wien ( class of Margarethe Bence and Lied-class of David Lutz 1990 – 1992 ) and later in Germany by Athe Pars and Georg Fortune .
 Savonlinna, Kangasniemi, Konservatorium der Stadt Wien
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Savonlinna, Kangasniemi, Konservatorium der Stadt Wien