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He played for hours daily , watching others and learning from more experienced guitarists , and listening to blues artists such as Muddy Waters , B.B. King , Howlin ' Wolf , and Robert Johnson .
 person: Muddy Waters; person: B.B. King; person: Howlin ' Wolf; person: Robert Johnson
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Muddy Waters, B.B. King, Howlin ' Wolf, Robert Johnson 
Answer:
 person: Muddy Waters; person: B.B. King; person: Howlin ' Wolf; person: Robert Johnson