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In 1975 , Deep Purple guitarist Ritchie Blackmore founded the band Rainbow and hired Dio to be his lead singer ; during his tenure , the band released three studio albums .
 organization: Deep Purple; person: Ritchie Blackmore; organization: Rainbow; organization: Dio
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Deep Purple; person: Ritchie Blackmore; organization: Rainbow; organization: Dio