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Stationed at Windsor , he had continual opportunities to attend concerts in London under conductors including Sir Thomas Beecham and Bruno Walter .
 Windsor, London, Thomas Beecham, Bruno Walter
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Windsor, London, Thomas Beecham, Bruno Walter