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These people included the composers Karlheinz Stockhausen and Gottfried Michael Koenig , both then working on groundbreaking electronic music .
 person: Karlheinz Stockhausen; person: Gottfried Michael Koenig
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Karlheinz Stockhausen; person: Gottfried Michael Koenig