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In the late 60 's and early 70 's he performed on the folk music circuits in Ann Arbor , Boston , Boulder , and San Francisco , working and traveling with U Utah Phillips , Andy Cohen , George Pedersen , George Koppel ( a.k.a Van Rozay ) , Kate McGarrigle and guitarist John Bian .
 Ann Arbor, Andy, Kate McGarrigle
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ann Arbor, Andy, Kate McGarrigle