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Halford performed as the vocalist for Black Sabbath for three shows .
 person: Halford; organization: Black Sabbath
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: Halford, Black Sabbath 
Answer:
 person: Halford; organization: Black Sabbath