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He was a Special Commissioner for the Royal School of Church Music in 1958 – 1972 , Director of the Royal School of Church Music 1972 – 1990 ; President of the Incorporated Association Of Organists 1972 – 1975 ; Secretary of the Cathedral Organists ' Association 1972 – 1988 ; President of the Royal College of Organists 1976 – 1978 .
 Organists, Organists, Royal College of Organists
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Organists, Organists, Royal College of Organists