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He sang " Sunday Morning " by Maroon 5 and was praised by all the judges , notably Simon Cowell , who called him a " genuinely good singer , " as well as guest judge Katy Perry .
 person: Simon Cowell; person: Katy Perry
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: Simon Cowell, Katy Perry 
Answer:
 person: Simon Cowell; person: Katy Perry