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In 1929 he played the solo part in the premiere of William Walton 's viola concerto , after Lionel Tertis , for whom it was written , turned it down .
 William Walton, Lionel Tertis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 William Walton, Lionel Tertis