While the term refers to an elaborate solo song frequently used in opera, the term refers to sung dialogue frequently used in opera. the text of an opera, meanwhile, is known as the

Aria, recitative, libretto.

Explanation:

Aria refer to long and elaborate song for a solo voice, typically one in an opera.

Recitative is a musical declamation of the kind usual in the narrative and dialogue parts of opera and oratorio.

Libretto is the text of an opera or other long vocal work.

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