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2 , dedicated to Léon Goossens who played the first performance in a BBC broadcast on 6 August 1933 , and a set of choral variations " A Boy was Born " , written in 1933 for the BBC Singers , who first performed it the following year .
 Léon Goossens, BBC, BBC Singers
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Léon Goossens, BBC, BBC Singers