Problem: Background: Joe Jackson Gibbs (born November 25, 1940) is a former American football coach, current NASCAR Championship team owner, and former NHRA team owner. He was the 20th and 26th head coach in the history of the Washington Redskins (1981-1992, 2004-2007). Well known for his long hours and work ethic, Gibbs constructed what Steve Sabol has called, "The most diverse dynasty in NFL history", building championship teams with many players who have had mediocre to average careers while playing for other NFL teams. During his first stint in the National Football League, he coached the Redskins for 12 seasons and led them to eight playoff appearances, four NFC Championship titles, and three Super Bowl titles.
Context: Although Gibbs helped craft a passing-oriented attack during his time in San Diego, his Redskins teams were known to incorporate a smash-mouth, rushing-oriented attack like the counter trey. By building a strong offensive line (known as "The Hogs") Gibbs was able to control the line of scrimmage, allowing workhorse running backs such as John Riggins, George Rogers, and Earnest Byner to power the ground game. Gibbs added a deep passing attack to this which complemented the ground game, utilizing agile receivers such as Art Monk, Gary Clark, and Ricky Sanders. Gibbs' offense was aided during his tenure by aggressive defensive units under the direction of defensive coordinator Richie Petitbon.  Gibbs' system and offensive scheme were robust enough to be successful without a Hall-of-Fame-caliber quarterback at the helm. The Redskins' Super Bowl victories were won featuring Joe Theismann, Doug Williams, and Mark Rypien--capable players who were very successful along with their strong supporting cast.  Gibbs is credited with inventing the single back, double or triple tight end set. He used it to neutralize Hall of Fame linebacker Lawrence Taylor, realizing that to successfully block him with a running back was impossible; an extra tight end and a tackle were required as well. The extra tight end provided additional protection for the quarterback. Gibbs was also credited for creating the Trips formation; stacking three wide receivers to one side. Gibbs incorporated the shifting and motions for which his offenses were known. The formations created mismatches and confusion for the opposing defenses that would then be exploited. He is also one of few coaches that utilized the H-back position prominently in his offense.
Question: When did he develop the single back defense?
Answer: 

Problem: Background: A-Teens (stylized as A*Teens) were a Swedish pop music group from Stockholm, Sweden, formed by Niklas Berg in 1998 as an ABBA tribute band called ABBA Teens and later renamed A-Teens. The band members were Marie Serneholt, Amit Sebastian Paul, Dhani Lennevald and Sara Lumholdt. The band's debut album became a success around the world and in 2001 it was reported that the band had sold 6 million albums worldwide. After six years together, the band announced they would take a break in 2004 after the release of their Greatest Hits album.
Context: In 1998, Marie, Sara, Dhani, and Amit were musically united as the ABBA Teens. However, the group's name was changed to the A-Teens to avoid litigation. This choice allowed the band more freedom in creating their own style of music.  In early 1999, the band started the recording process of what would be their debut album, The ABBA Generation, consisting purely of ABBA covers reinterpreted with a modern pop and electronic flair to appeal to a new generation of young pop fans. Their first single, "Mamma Mia", topped the charts in over ten countries including their home country Sweden where it stayed at number one for eight consecutive weeks. The album hit the peak position in Sweden & Chile and became a top ten hit throughout the world. Further singles enjoyed similar success ensuring top ten placings across the globe, and the album overall sold more than 3 million copies worldwide, being certified Gold or Platinum in over 22 different countries.  The band's music video for "Dancing Queen" features a plot very similar to the 1985 John Hughes film The Breakfast Club. In addition, the principal seen in the music video was played by Paul Gleason, the same actor who was the principal in the film. The single reached ninety-five on the Billboard Hot 100 and sold over 500,000 copies in the U.S. alone, being certified Gold.  In early 2000, the band embarked on a U.S. promotional tour, and on the verge of the release of their album in the United States, the band was invited to tour with Britney Spears that summer in her U.S. Tour. They also made several appearances on Disney and Nickelodeon to promote their music. The band's debut became a hit in North America, where the album reached seventy-one on the Billboard 200 Albums Chart being certified Gold in September 2000, but its sales reached the million mark in 2001.  That month, the A-Teens won a Viva Music Award for Best International Newcomer, competing with the likes of Christina Aguilera and Blink-182, and also the band announced what would be the lead single from their second album and their first to be an original song, "Upside Down", which would also become their signature song. The song was released to Swedish radios on 23 October 2000, and was later unleashed worldwide. When the single was commercially released, it reached number two in Sweden and was later certified 2x Platinum. The song became the band's biggest hit when it reached the top ten in several countries and when the single was released in the United States. The physical single reached number six on the Billboard Hot 100 Single Sales Chart, selling over 500,000 copies in three weeks and being certified Gold. In January 2001, the band was nominated for "Best Swedish Group" at the NRJ Awards.
Question: What did they do after the album was released?
Answer:
In early 2000, the band embarked on a U.S. promotional tour, and on the verge of the release of their album in the United States,