Ballad-opera

The ballad opera is a genre of English stage entertainment that originated in the early 18th century, and continued to develop over the following century and later. 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. Music critic Peter Gammond describes the ballad opera as "an important step in the emancipation of both the musical stage and the popular song."

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.

It is generally accepted that the first ballad opera, and the one that was to prove the most successful, was The Beggar's Opera of 1728. It had a libretto by John Gay and music arranged by Johann Christoph Pepusch, both of whom probably experienced vaudeville theatre in Paris, and may have been motivated to reproduce it in an English form. They were also probably influenced by the burlesques and musical plays of Thomas D'Urfey (1653–1723) who had a reputation for fitting new words to existing songs; a popular anthology of these settings was published in 1700 and frequently re-issued. A number of the tunes from this anthology were recycled in The Beggar's Opera.

...
Wikipedia