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He was one of the first pianists of the twentieth century to focus purely on the works of Johann Sebastian Bach , and was known for his academic and cerebral approach .
 person: Johann Sebastian Bach
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: Johann Sebastian Bach