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Later it moved into a more pastoral form , like Isaac Bickerstaffe 's " Love in a Village " ( 1763 ) and Shield 's " Rosina " ( 1781 ) , using more original music that imitated , rather than reproduced , existing ballads .
 Isaac Bickerstaffe, Shield
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Isaac Bickerstaffe, Shield