Assertion: ballad's story | /r/CapableOf | involve lower class
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Source sentences:
text: It consists of racy and often satirical spoken (English) dialogue, interspersed with songs that are deliberately kept very short (mostly a single short stanza and refrain) to minimize disruptions to the flow of the story, which involves lower class, often criminal, characters, and typically shows a suspension (or inversion) of the high moral values of the Italian opera of the period.