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During his career he played over 200 concert appearances with the Boston Pops Orchestra ( in Boston and on nationwide concert tours ) , Appeared a number of times with the New York Philharmonic and Baltimore Symphony Orchestra as well as gave hundreds of solo concerts throughout the United States under Columbia Artists Management , on their Community Concerts Series .
 Boston, Orchestra, Boston, New York Philharmonic, Baltimore Symphony Orchestra, Columbia Artists Management
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Boston, Orchestra, Boston, New York Philharmonic, Baltimore Symphony Orchestra, Columbia Artists Management