79960
As a chamber musician , he formed two string quartets , one while he was in Brussels and one with David Popper during his Budapest ( Budapest Quartet ) years .
 Brussels, David Popper, Budapest, Budapest Quartet
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Brussels, David Popper, Budapest, Budapest Quartet