
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 sub-genres. Like the earlier comédie en vaudeville and the later Singspiel, its distinguishing characteristic is the use of tunes in a p...
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http://en.wikipedia.org/wiki/Ballad_opera

characteristic English type of comic opera, originating in the 18th century and featuring farcical or extravaganza plots. The music was mainly ... [3 related articles]
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http://www.britannica.com/eb/a-z/b/12

An eighteenth-century comic drama featuring lyrics set to existing popular tunes. The term originate
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http://www.encyclo.co.uk/local/22385

A musical with songs based on popular melodies or tunes e.g. THE BEGGARS OPERA.
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http://www.encyclo.co.uk/visitor-contributions.php

a popular form of stage entertainment in the 18th century consisting of spoken dialogue alternating with musical numbers taken from ballad tunes
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https://www.victorianopera.com.au/opera-glossary
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