Opéra-ballet (French; plural: opéras-ballets) was a popular genre of FrenchBaroque lyric theatre, combining elements of opera and ballet, "that grew out of the ballets à entrées of the early seventeenth century". It differed from the more elevated tragédie en musique as practised by Jean-Baptiste Lully in several ways. It contained more dance music than the tragédie, and the plots were not necessarily derived from classical mythology and allowed for the comic elements, which Lully had excluded from the tragédie en musique after Thésée (1675). The opéra-ballet consisted of a prologue followed by a number of self-contained acts (also known as entrées), often loosely grouped around a single theme. The individual acts could also be performed independently, in which case they were known as actes de ballet.
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Pitou, Spire (1983). The Paris Opéra. An Encyclopedia of Operas, Ballets, Composers, and Performers – Genesis and Glory, 1671-1715. Westport, Connecticut: Greenwood Press. ISBN 9780313214202.
Warrack, John; West, Ewan (1992). The Oxford Dictionary of Opera. Oxford: Oxford University Press. ISBN 9780198691648.