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Clapton was scheduled to perform at the Rock and Roll Hall of Fame 's 25th anniversary concert in Madison Square Garden on 2009 , but cancelled due to gallstone surgery .
 Clapton, Rock and Roll Hall of Fame, Madison Square Garden
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Clapton, Rock and Roll Hall of Fame, Madison Square Garden