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The show started at 6pm when the host , BBC Radio 1 presenter Peter Powell , introduced the opening act " Prince Charles and the City Beat Band " , which was followed by Robert Palmer who included the songs Johnny and Mary and Some Guys Have All the Luck in his performance .
 person: Peter Powell; person: Robert Palmer
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: Peter Powell, Robert Palmer 
Answer:
 person: Peter Powell; person: Robert Palmer