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Arnold Jacobs , a tubist and well-regarded brass teacher , believed that it was best for the student to focus on his or her use of the air and musical expression to allow the embouchure to develop naturally on its own .
 Arnold Jacobs
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Arnold Jacobs