Burlesque, also known as travesty, is a genre of entertainment. Prior to burlesque becoming associated with striptease, it was a form of musical and theatrical parody in which an opera or piece of classical theatre is adapted in a broad, often risqué style very different from that for which it was originally known.
Burlesque originated early in the Victorian Era, when the social rules of established aristocracy and working-class society clashed. The genre often mocked such established entertainment forms as opera, Shakespearean drama and ballet. The burlesque was a logical descendant of ballad opera and other forms of comic musical entertainments.
Burlesque began with Madame Vestris' management at the Olympic Theatre in 1831. There she produced Olympic Revels by J. R. Planché. In the early burlesques, the words of the songs were written to popular music in the same way that had been done earlier in The Beggar's Opera. Later, in the Victorian era, burlesque mixed operetta, music hall and revue, and was often known as extravaganza. W. S. Gilbert wrote several burlesques early in his career, including Dulcamara, or the Little Duck and the Great Quack (1866), La Vivandière, or, True to the Corps! (1867) and Robert the Devil (1868). In the 1970s, Lydia Thompson's burlesque troupe, with Willie Edouin, became famous for their burlesques, by such authors as H. B. Farnie and Robert Reece, both in Britain and the U.S.
Burlesque became the specialty of London's Gaiety Theatre and Royal Strand Theatre from the 1860s to the early 1890s. In the 1860s and 1870s, burlesques were one-act pieces running less than an hour and using pastiches and parodies of popular songs, opera arias and other music that the audience would readily recognize. Beginning in the 1880s, composers like Meyer Lutz and Osmond Carr contributed original music, and the shows were extended to a full-length two or three act format. Nellie Farren, as the theatre's "principal boy," and Fred Leslie starred at the Gaiety during that period, and Leslie wrote the libretti for many of these pieces under his pseudonym, "A. C. Torr". In the early 1890s, musical burlesque went out of fashion, and the Gaiety Theatre's focus changed to the new genre of Edwardian musical comedy.
By the 1880s, the genre had created some rules for defining itself:
The name "burlesque" is derived from the Italian burla, which means "jest." The form began as comic parodies of well-known topics or people.
The term "travesty" combines the Latin words trans-, meaning "across, over" and vestere, "to dress or to wear". According to the Oxford English Dictionary, the word travesty originally meant "to disguise by changing costume" specifically "in the attire of the opposite sex".  In modern literary theory, the word continues to hold this meaning in reference to dramatic works: transvestism onstage is referred to as travesty. In particular "travesty roles" are dramatic roles in which the sex of the character is opposite that of the performer.
Ruy Blas and the Blase Roue made fun of the play Ruy Blas by Victor Hugo. The title was a pun, and the worse the pun, the more Victorian audiences were amused. Other Gaiety burlesques included Robert the Devil (1868), The Bohemian G-yurl and the Unapproachable Pole (1877), Blue Beard (1882), Ariel (1883, by F. C. Burnand), Galatea, or Pygmalion Reversed (1883), Little Jack Sheppard (1885), Monte Cristo, Jr. (1886), Pretty Esmeralda (1887), Frankenstein, or The Vampire's Victim (1887), Mazeppa, Faust up to date (1888), Carmen up to Data (1890), Cinder Ellen up too Late (1891), and Don Juan (1892, with lyrics by Adrian Ross).
Well known ragtime travesties include The Russian Rag, by George L. Cobb, which is based on Rachmaninoff's Prelude in C-sharp minor, and Felix Arndt's Lucy's Sextette based on a sextet from Lucia di Lammermoor by Donizetti.
In more recent times, the score for the film The Cool Mikado is a travesty on the original Gilbert and Sullivan music. Comedic musician "Weird Al" Yankovic writes songs, specifically songs such as the "Angry White Boy Polka" and "Polkrama," that can be considered travesties, as they take the lyrics and music of popular songs and re-arrange them into the style of Polka.