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The orchestra became increasingly popular , Bilse toured Europe and gave guest concerts in Saint Petersburg , Riga , Warsaw , Amsterdam , Vienna , as well as at the 1867 Exposition Universelle in Paris , where his band performed The Blue Danube together with Johann Strauss II .
 Bilse, Saint Petersburg, Riga, Warsaw, Amsterdam, Vienna, Paris, Johann Strauss II
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bilse, Saint Petersburg, Riga, Warsaw, Amsterdam, Vienna, Paris, Johann Strauss II