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However , possibly influenced by Paul Hindemith 's concept of Gebrauchsmusik ( music that serves a social function ) , and as an avid socialist , he wrote a number of pieces for workers ' unions and communist theatre groups .
 person: Paul Hindemith
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Paul Hindemith 
Answer:
 person: Paul Hindemith