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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 .
 person: Isaac Bickerstaffe; person: Shield
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Isaac Bickerstaffe, Shield 
Answer:
 person: Isaac Bickerstaffe; person: Shield