The incorporation of folk music into concert pieces, songs, and operas was part of a nineteenth-century trend called Nationalism.
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What is nationalism?</h3>
This is the identification with one's own nation and support for interest.
Nationalism is seen here as folk music is incorporated into concert pieces and songs where people identified and supported their own.
Read more about <em>nationalism</em> here:
brainly.com/question/1287645
