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Knut Kiesewetter ( born 13 September 1941 ) is a German jazz musician , singer , songwriter and producer .
 Knut Kiesewetter, German
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Knut Kiesewetter, German