8591
He composed a sinfonia a 8 voci in 1766 , and some of his violin studies and other compositions are in the possession of the Gesellschaft der Musikfreunde at Vienna .
 Gesellschaft der Musikfreunde, Vienna
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gesellschaft der Musikfreunde, Vienna