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From the 1960 s through the end of the century Gary Karr was the leading proponent of the double bass as a solo instrument and was active in commissioning or having hundreds of new works and concerti written especially for him .
 person: Gary Karr
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: Gary Karr 
Answer:
 person: Gary Karr