8871
In the mid-1970 s Dio 's vocals caught the ear of Deep Purple guitarist Ritchie Blackmore , who was planning on leaving them due to creative differences over the band 's new direction .
 organization: Dio; organization: Deep Purple; person: Ritchie Blackmore
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: Dio; organization: Deep Purple; person: Ritchie Blackmore