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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 .
 Peter Powell, Robert Palmer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Peter Powell, Robert Palmer