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Biography Born into a musical family ( Wendler 's father , Prof. Dr. Anton Wendler , worked as a tenor and assistant director at the Vienna State Opera while his mother had a brief career as an operatic soprano before switching careers to work for the United Nations ) , Wendler attended the Vienna Choir Boys from 1985 until 1989 , participating in four tours around the globe , singing in more than 500 concerts and opera performances , sharing stages with José Carreras , Agnes Baltsa , and Alfredo Kraus , and working with conductors such as Colin Davis and Horst Stein .
 Wendler, Wendler, United Nations, Wendler, José Carreras, Agnes Baltsa, Alfredo Kraus, Colin Davis, Horst Stein
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Wendler, Wendler, United Nations, Wendler, José Carreras, Agnes Baltsa, Alfredo Kraus, Colin Davis, Horst Stein