Answer the question at the end by quoting:

A burlesque is a literary, dramatic or musical work intended to cause laughter by caricaturing the manner or spirit of serious works, or by ludicrous treatment of their subjects. The word derives from the Italian burlesco, which, in turn, is derived from the Italian burla - a joke, ridicule or mockery. Burlesque overlaps in meaning with caricature, parody and travesty, and, in its theatrical sense, with extravaganza, as presented during the Victorian era. "Burlesque" has been used in English in this literary and theatrical sense since the late 17th century.
Victorian burlesque, sometimes known as "travesty" or "extravaganza", was popular in London theatres between the 1830s and the 1890s. It took the form of musical theatre parody in which a well-known opera, play or ballet was adapted into a broad comic play, usually a musical play, often risque in style, mocking the theatrical and musical conventions and styles of the original work, and quoting or pastiching text or music from the original work. The comedy often stemmed from the incongruity and absurdity of the classical subjects, with realistic historical dress and settings, being juxtaposed with the modern activities portrayed by the actors. Madame Vestris produced burlesques at the Olympic Theatre beginning in 1831 with Olympic Revels by J. R. Planche. Other authors of burlesques included H. J. Byron, G. R. Sims, F. C. Burnand, W. S. Gilbert and Fred Leslie.  Victorian burlesque related to and in part derived from traditional English pantomime "with the addition of gags and 'turns'." In the early burlesques, following the example of ballad opera, the words of the songs were written to popular music; later burlesques mixed the music of opera, operetta, music hall and revue, and some of the more ambitious shows had original music composed for them. This English style of burlesque was successfully introduced to New York in the 1840s.  Some of the most frequent subjects for burlesque were the plays of Shakespeare and grand opera. The dialogue was generally written in rhyming couplets, liberally peppered with bad puns. A typical example from a burlesque of Macbeth: Macbeth and Banquo enter under an umbrella, and the witches greet them with "Hail! hail! hail!" Macbeth asks Banquo, "What mean these salutations, noble thane?" and is told, "These showers of 'Hail' anticipate your 'reign'". A staple of burlesque was the display of attractive women in travesty roles, dressed in tights to show off their legs, but the plays themselves were seldom more than modestly risque.  Burlesque became the speciality of certain London theatres, including the Gaiety and Royal Strand Theatre from the 1860s to the early 1890s. Until the 1870s, burlesques were often 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. The house stars included Nellie Farren, John D'Auban, Edward Terry and Fred Leslie. From about 1880, Victorian burlesques grew longer, until they were a whole evening's entertainment rather than part of a double- or triple-bill. In the early 1890s, these burlesques went out of fashion in London, and the focus of the Gaiety and other burlesque theatres changed to the new more wholesome but less literary genre of Edwardian musical comedy.

Why did they go out of fashion?

London, and the focus of the Gaiety and other burlesque theatres changed to the new more wholesome but less literary genre of Edwardian musical comedy.

IN: Christina Maria Aguilera (born December 18, 1980) is an American singer, songwriter, actress, reality show personality and television personality. Born in Staten Island, New York and raised in Rochester and Wexford, Pennsylvania, she appeared on the television series Star Search and The Mickey Mouse Club in her early years. After recording "Reflection", the theme for Disney's 1998 film Mulan, Aguilera signed with RCA Records. She rose to prominence with her 1999 self-titled debut album that spawned the US Billboard Hot 100 number-one singles "Genie in a Bottle", "What a Girl Wants", and "Come On Over Baby

Christina Maria Aguilera was born in the Staten Island borough of New York City, New York, on December 18, 1980, to Shelly Loraine Kearns (nee Fidler), a musician, and Fausto Xavier Aguilera, a United States Army soldier. Her father is Ecuadorian, while her mother has German, Irish, Welsh, and Dutch ancestry. Her family moved frequently because of her father's military service, and lived in places including New Jersey, Texas, New York, and Japan. Aguilera and her mother alleged that her father was physically and emotionally abusive, claims which he denied; Aguilera used music as a form of escape from her turbulent household. Following her parents' divorce when she was six years old, Aguilera, her younger sister Rachel, and her mother (who later remarried Jim Kearns and gave birth to one more child, Michael 'Mikey' Kearns), moved into her grandmother's home in the Pittsburgh suburb of Rochester, Pennsylvania. After several years of being estranged, Aguilera expressed interest in reconciling with her father in 2012.  Growing up, Aguilera, known locally as "the little girl with the big voice", aspired to be a singer, singing in local talent shows and competitions. She won her first talent show at the age of 8, in which she performed Whitney Houston's "I Wanna Dance with Somebody (Who Loves Me)". In 1990, she appeared on Star Search singing "A Sunday Kind of Love", and was eliminated during the semi-final rounds. She later performed the same song during an appearance on Pittsburgh's KDKA-TV's Wake Up with Larry Richert. Throughout her youth in Pittsburgh, Aguilera sang "The Star-Spangled Banner" before Pittsburgh Penguins hockey, Pittsburgh Steelers football, and Pittsburgh Pirates baseball games, in addition to the 1992 Stanley Cup Finals. She attended Rochester Area School District in Rochester and Marshall Middle School near Wexford, and briefly attended North Allegheny Intermediate High School before being home schooled due to bullying.  In 1991, Aguilera auditioned for a position on The Mickey Mouse Club, although she did not meet its age requirements. She joined the television series two years later, where she performed musical numbers and sketch comedy until its cancellation in 1994. Her co-stars included Ryan Gosling, Keri Russell, Britney Spears, and Justin Timberlake. When she was fourteen, Aguilera recorded her first song, the duet "All I Wanna Do" with Japanese singer Keizo Nakanishi. She later sent her cover version of Houston's "Run to You" to Walt Disney Pictures in hopes of being selected to record the theme song "Reflection" for their animated film Mulan (1998). "Reflection" peaked at number 19 on the U.S. Billboard Adult Contemporary Chart.

How long was she on the show?

OUT:
until its cancellation in 1994.