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According to the liner notes of the compilation release " Rock of Ages : The Definitive Collection " , the band was at a recording studio when lead vocalist Joe Elliott stumbled upon a hymn book left by a member of a children 's choir that had just used the studio .
 Joe Elliott
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Joe Elliott