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His vocal style , a smooth and often laid-back tenor , differed greatly from many of the harsher voices of Delta bluesmen such as Charley Patton .
 organization: Delta; person: Charley Patton
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Delta, Charley Patton 
Answer:
 organization: Delta; person: Charley Patton