139941
Within days of the concert commemorating the recently deceased Bill Graham at which he had played with the Dead , Garcia and the JGB embarked on a month-long tour of the East Coast and the Midwest in November .... the Virginia locale drew in a special guest , Bruce Hornsby on electric piano , who sat in for the entire show .
 Bill Graham, Bruce Hornsby
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bill Graham, Bruce Hornsby