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He performed regularly with the Boston Symphony Orchestra as an organist and as a harpsichordist , and he performed extensively with noted violinist Robert Brink , with whom he commissioned a duo for violin and harpsichord from Alan Hovhaness .
 Boston Symphony Orchestra, Robert Brink, Alan Hovhaness
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 Symphony Orchestra, Robert Brink, Alan Hovhaness