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He is also known for his ability to collaborate with other musicians and has done so with Eugene Martynec , John Gzowski , George Koller , Barry Prophet , Julian Knight and John Armstrong .
 George Koller
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 George Koller