Question: When was the style of music of Folder 5 developed?

Context paragraphs:
Folder 5: Folder 5 (also spelled Folder5) (フォルダファイヴ "Forudafaivu") were a five-girl Japanese pop idol group on the Avex Trax music label.  The group's music was known for its Eurobeat style.  The band's music was produced by Takashi Kimura.

Keith style: The Keith style of playing the 5-string banjo emphasizes the melody of the song.  Also known as the "Melodic" or "Chromatic style", it was first developed and popularized independently by Bobby Thompson and Bill Keith in the early 1960s.  It is used primarily by bluegrass banjoists, though it can be applied to virtually any genre.  Most banjoists who play Keith style do not use it exclusively, but integrate it as one aspect of their playing, a way of adding spice to the more common 3-finger style of Earl Scruggs.

Tokyo Kodomo Club: Tokyo Kodomo Club (東京こどもクラブ , Tōkyō Kodomo Kurabu ) , meaning Tokyo Children Club, is an early childhood education program published in Japan in an audio-visual format, distributed monthly on a record.  The 7-inch record contained stories and songs, accompanied by a picture book that could be bound in a special folder.  The early-childhood education program came in two courses: a 2-4 year old course and a 5-7 year old course.  Each of the courses was designed to complete in 12 months.  In addition on a quarterly basis, the Club sent out supplemental stories, songs and other music on a 12-inch record.  The recitations on Side A were by "Uncle Maeda" (前田武彦 , Takehiko Maeda ) , and on Side B, "Bin-chan" (楠トシエ , Toshie Kusunoki ) .  The records were monaural recordings at 33-1/3 rpm.  Presently, the recordings have gone out of print, making their procurement quite difficult.

Soul blues: Soul blues is a style of blues music developed in the late 1960s and early 1970s that combines elements of soul music and urban contemporary music.  Singers and musicians who grew up listening to the traditional electric blues of artists such as Muddy Waters, Bo Diddley, Jimmy Reed and Elmore James; soul singers such as Sam Cooke, Ray Charles and Otis Redding; and gospel music wanted to bridge their favorite music together.  Bobby Bland was one of the pioneers of this style.  This is a subgenre of blues that is very popular with African American audiences but less known by white audiences.  The style continues to be popular in the new millennium.

Hip hop: Hip hop or hip-hop is a subculture and art movement developed in South Bronx in New York City during the late 1970s.  While people unfamiliar with hip hop culture often use the expression "hip hop" to refer exclusively to hip hop music (also called "rap"), Hip hop is characterized by nine distinct elements or expressive realms, of which hip hop music is only four elements (rapping, djaying, beatboxing and breaking).  Afrika Bambaataa of the hip hop collective Zulu Nation outlined the pillars of hip hop culture, coining the terms: "rapping" (also called MCing or emceeing), a rhythmic vocal rhyming style (orality); DJing (and turntablism), which is making music with record players and DJ mixers (aural/sound and music creation); b-boying/b-girling/breakdancing (movement/dance); and graffiti art, which he called "aerosol writin'", although many say that the graffiti that hip hop adopted had been around years earlier, and had nothing to do with hip hop culture.  (visual art).  Other elements of hip hop subculture and arts movements beyond the main four are: hip hop culture and historical knowledge of the movement (intellectual/philosophical); beatboxing, a percussive vocal style; street entrepreneurship; hip hop language; and hip hop fashion and style, among others.

Eurobeat: Eurobeat is either a form of the British dance-pop variant of Eurodisco or Hi-NRG-driven Italo disco music that both developed in 1980s.

Kansas City jazz: Kansas City jazz is a style of jazz that developed in Kansas City, Kansas and Kansas City, Missouri and the surrounding Kansas City Metropolitan Area during the 1930s and marked the transition from the structured big band style to the musical improvisation style of Bebop.  The hard-swinging, bluesy transition style is bracketed by Count Basie who in 1929 signed with the Bennie Moten's Kansas City Orchestra and Kansas City native Charlie Parker who was to usher in the Bebop style in the 1940s.  According to a Kansas City website, "While New Orleans was the birthplace of jazz, America's music grew up in Kansas City".  Kansas City is known as one of the most popular "cradles of jazz".  Other cities include New Orleans, Chicago, St. Louis, Pittsburgh, Philadelphia, and New York City.

Tecnocumbia: Tecnocumbia is a style of Cumbia where there is a fusion between electronic sounds generated by electronic musical instruments through electronic drums, the electric guitar, synthesisers, and samplers.  "Tecnocumbia" was a word developed in Mexico to describe this type of music.  However, the style of music was developed throughout South America with different names given to it before the name "Tecnocumbia" was adopted as the single denomynation for the music.

Five Style: Five Style (a name taken from a martial arts technique called "Five Style Fist"), also known as 5ive Style, is a Chicago-based funk/jam quartet.  Their albums were released on the Subpop label in the 1990s.  The group existed from about 1993-2000 in various incarnations, centered on the guitar work of Billy Dolan (who has also played in Heroic Doses, and The Fire Theft which featured 3 members of Sunny Day Real Estate, among other projects).  Other members were major players of the 1990s Chicago music scene and included bassist Leroy Bach (of Chicago funk group Uptighty, the first Liz Phair studio band, and Wilco fame), drummer John Herndon (aka "Johnny Machine", who made his first appearances on record in "Tool of the Man" era Poster Children and became established as a longstanding drummer/percussionist in Tortoise), and keyboardist Jeremy Jacobsen (also known as The Lonesome Organist and member of Euphone).  Drummer Ryan Rapsys, also of Euphone and Gauge, filled in on drums on a January 2000 tour when they opened for Giant Sand and Vic Chesnutt.  5ive Style were the opening act in a brief May 1996 tour which also included The Sea and Cake and Tortoise; by some accounts these dates were the best shows of the Chicago "post-rock" hey day.

Hyper Groove Party: Hyper Groove Party is a Folder 5 album released on January 22, 2003.  It is a collection of mixed, shortened versions of their songs.

Supporting paragraphs: Folder 5 Eurobeat
Answer: 1980s