Question: When was the performer of Serious established?

full_context: Document 1: Electric Barbarella: "Electric Barbarella" is the 29th single by Duran Duran, and the first official single from the album "Medazzaland". In 1997, the single and album were released only in the United States; "Electric Barbarella" was not issued as a single in the UK until January 1999 on the back of the late 1998 release of the compilation album "Greatest".
Document 2: Only After Dark (album): "Only After Dark" is a compilation album that was compiled by Nick Rhodes and John Taylor from Duran Duran, and recreates a night at Birmingham's Rum Runner nightclub, during the post punk days of the late 70s/early 80s when a new sound of glam/punk/electronica started to crystallize. The CD captures some of the discs that Nick spun when he was deejaying for £10 a night at the club and Duran Duran were the resident band. The inspiration for it came when in 2000 John and Nick spent hours selecting 50 tracks for a 4-hour radio broadcast entitled "A Night At The Rum Runner". The 18 track CD was released on 8 May 2006 and presented in a silver gatefold card sleeve in shocking pink metallic print featuring photographs taken from this period, first published in the book "Duran Duran Unseen" by Paul Edmond, the front cover photo being of fashion designer Patti Bell.
Document 3: The Reflex: "The Reflex" is the eleventh single by Duran Duran, released worldwide on 16 April 1984. The song was heavily remixed for single release and was the third and last to be taken from their third album "Seven and the Ragged Tiger".
Document 4: Seven and the Ragged Tiger: Seven and the Ragged Tiger is the third studio album by English new wave band Duran Duran. It was released on 21 November 1983 by EMI. It was the band's first and only number one album on the UK Albums Chart, and would prove to be the last studio album for the band's most famous line-up until 2004's "Astronaut".
Document 5: Hang in Long Enough: "Hang in Long Enough" is a single performed by Phil Collins and released in 1990 from the album "...But Seriously". It was the sixth and last single from the album. The song was a moderate hit, reaching the #23 spot on the U.S. "Billboard" Hot 100 and #34 on the UK Singles Chart.
Document 6: List of UK Singles Chart number ones of the 1980s: American entertainer Madonna was the most successful act of the decade in terms of number - one singles. She had six number ones: ``Into the Groove ''(1985);`` Papa Do n't Preach'', ``True Blue ''(both 1986);`` La Isla Bonita'', ``Who's That Girl ''(both 1987); and`` Like a Prayer'' (1989). George Michael had significant involvement with seven number - one singles; he was also involved with Band Aid single ``Do They Know It's Christmas? ''but his contribution was less significant. He had two number - one singles as a solo artist, four as a member of pop duo Wham!, and one as a duet with Aretha Franklin. The following artists achieved three or more number - one hits during the 1980s.
Document 7: Hard rock: Bon Jovi's third album, Slippery When Wet (1986), mixed hard rock with a pop sensitivity and spent a total of 8 weeks at the top of the Billboard 200 album chart, selling 12 million copies in the US while becoming the first hard rock album to spawn three top 10 singles — two of which reached number one. The album has been credited with widening the audiences for the genre, particularly by appealing to women as well as the traditional male dominated audience, and opening the door to MTV and commercial success for other bands at the end of the decade. The anthemic The Final Countdown (1986) by Swedish group Europe was an international hit, reaching number eight on the US charts while hitting the top 10 in nine other countries. This era also saw more glam-infused American hard rock bands come to the forefront, with both Poison and Cinderella releasing their multi-platinum début albums in 1986. Van Halen released 5150 (1986), their first album with Sammy Hagar on lead vocals, which was number one in the US for three weeks and sold over 6 million copies. By the second half of the decade, hard rock had become the most reliable form of commercial popular music in the United States.
Document 8: Come Undone (Duran Duran song): "Come Undone" is a song by British band Duran Duran. It was released in March 1993 as the second single from the album "Duran Duran (The Wedding Album)". It is their 24th single overall.
Document 9: Post-punk: The original post-punk movement ended as the bands associated with the movement turned away from its aesthetics, often in favor of more commercial sounds. Many of these groups would continue recording as part of the new pop movement, with entryism becoming a popular concept. In the United States, driven by MTV and modern rock radio stations, a number of post-punk acts had an influence on or became part of the Second British Invasion of "New Music" there. Some shifted to a more commercial new wave sound (such as Gang of Four), while others were fixtures on American college radio and became early examples of alternative rock. Perhaps the most successful band to emerge from post-punk was U2, who combined elements of religious imagery together with political commentary into their often anthemic music.
Document 10: Hard rock: Established bands made something of a comeback in the mid-1980s. After an 8-year separation, Deep Purple returned with the classic Machine Head line-up to produce Perfect Strangers (1984), which reached number five in the UK, hit the top five in five other countries, and was a platinum-seller in the US. After somewhat slower sales of its fourth album, Fair Warning, Van Halen rebounded with the Top 3 album Diver Down in 1982, then reached their commercial pinnacle with 1984. It reached number two on the Billboard album chart and provided the track "Jump", which reached number one on the singles chart and remained there for several weeks. Heart, after floundering during the first half of the decade, made a comeback with their eponymous ninth studio album which hit number one and contained four Top 10 singles including their first number one hit. The new medium of video channels was used with considerable success by bands formed in previous decades. Among the first were ZZ Top, who mixed hard blues rock with new wave music to produce a series of highly successful singles, beginning with "Gimme All Your Lovin'" (1983), which helped their albums Eliminator (1983) and Afterburner (1985) achieve diamond and multi-platinum status respectively. Others found renewed success in the singles charts with power ballads, including REO Speedwagon with "Keep on Loving You" (1980) and "Can't Fight This Feeling" (1984), Journey with "Don't Stop Believin'" (1981) and "Open Arms" (1982), Foreigner's "I Want to Know What Love Is", Scorpions' "Still Loving You" (both from 1984), Heart’s "What About Love" (1985) and "These Dreams" (1986), and Boston's "Amanda" (1986).
Document 11: Second British Invasion: During the Second British Invasion, established British acts such as Queen, David Bowie, Paul McCartney, Phil Collins, Rod Stewart and Elton John saw their popularity increase; a few acts that dated to the era of the original British Invasion, including George Harrison, Eddy Grant, The Hollies and The Moody Blues, had their last major hits in this time frame. Counting his work with Genesis, Collins had more top 40 hits on the Billboard Hot 100 chart during the 1980s than any other artist.
Document 12: Serious (Duran Duran song): "Serious" is the 22nd single by the English rock band Duran Duran. It was released 1 October 1990 as the second single from the "Liberty" album.
Document 13: Duran Duran: Duran Duran () are an English new wave band formed in Birmingham in 1978. The band were one of the most successful acts of the 1980s, but by the end of the decade, membership and music style changes challenged the band before a resurgence in the early 1990s. The group were a leading band in the MTV-driven Second British Invasion of the US in the 1980s. They achieved 14 singles in the top 10 of the UK Singles Chart and 21 in the US "Billboard" Hot 100, and have sold over 100 million records worldwide.
Document 14: Nice (song): "Nice" is the 34th single by British pop band Duran Duran. Released in 2005 to radio in Europe and as download only, it was the third single to be lifted from the group's "Astronaut" album.
Document 15: Serious Moonlight Tour: The Serious Moonlight Tour was launched in May 1983 in support of David Bowie's album "Let's Dance" (1983). The tour opened at the Vorst Forest Nationaal, Brussels, on 18 May 1983 and ended in the Hong Kong Coliseum on 8 December 1983; 15 countries visited, 96 performances, and over 2.6M tickets sold. The tour garnered mostly favorable reviews from the press.
ground_truth: 1978
sub_queries: Serious >> performer Answer: Duran Duran
When was Duran Duran established? Answer: 1978