Ballad opera
The term ballad opera is used to refer to a genre of English stage entertainment originating in the 18th century and continuing to develop in the following century and later. This article describes the principal subgenres. Like the earlier comédie en vaudeville and the later Singspiel, its distinguishing characteristic is the use of tunes in a popular style (either pre-existing or newly composed) with spoken dialogue. These English plays were 'operas' mainly insofar as they satirized the conventions of the imported opera seria.
Earliest ballad operas
Ballad opera has been called an "eighteenth-century protest against the Italian conquest of the London operatic scene" 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.