Problem: Background: JLS (an initialism of Jack the Lad Swing) were an English pop/R&B boy band, which consisted of members Aston Merrygold, Oritse Williams, Marvin Humes, and JB Gill, originally formed by Williams. They initially signed to Tracklacers production company New Track City and then went on to become runners-up of the fifth series of the ITV reality talent show The X Factor in 2008, coming second to Alexandra Burke. Following their appearance on The X Factor, JLS signed to Epic Records. Their first two singles "Beat Again" and "Everybody in Love" both went to number one on the UK Singles Chart.
Context: JLS began working on their third album, Jukebox in March 2011. In May 2011 it was confirmed that the first single will feature American singer-songwriter Dev, and is titled "She Makes Me Wanna". The song was produced by BeatGeek, Jimmy Joker, Teddy Sky, who are part of RedOne's production company, after the group bid PS30,000 for a recording session with the producer at Alicia Keys' Black Charity Ball in 2010. It was serviced to radio stations on 25 May 2011, while it was released for digital download on 24 July 2011. The album was released on 14 November 2011, and the band will embark on another UK arena tour in support of the album in March and April 2012. On 15 September, JLS announced that "Take a Chance on Me" would be their second single from their album Jukebox. It was released on 4 November 2011, and charted at number two on the UK Singles Chart. The song was written by Emile Ghantous, Frankie Bautista, Nasri Atweh, and Nick Turpin. The band's third single "Do You Feel What I Feel?" was released on 1 January 2012 and became their lowest-charting single to date, peaking at number sixteen. The album charted at number 2 on the UK Album Charts, making it the second consecutive album to miss the number 1 spot, and entered the Irish Album Charts at number 5.  In 2012, JLS recorded the official Sport Relief charity single, "Proud". It was released on 18 March 2012. The song was co-written with Daniel Davidsen, Jason Gill, Cutfather and Ali Tennant, who also worked on the Jukebox album. The band were among the performers at the Diamond Jubilee concert held outside Buckingham Palace on 4 June 2012. On 7 June 2012, they performed at the Royal Albert Hall for the Rays of Sunshine concert, which grants wishes for seriously ill youngsters in the UK aged 3-18 years old. On 8 June 2012, they were announced to perform at the iTunes Festival 2012, along with The X Factor alumni Olly Murs, One Direction and Rebecca Ferguson.  On 21 August 2012, JLS began filming a music video for "Hottest Girl in the World", the lead single from their fourth album. On 25 August, the band announced that their upcoming fourth album would be called Evolution. The album will be released on 5 November. On the direction of the album Merrygold said; "We didn't go by any kind of guidelines or anything like that, we just made what felt right and we're really excited about it." The band also confirmed that a Deluxe version of the LP will be available that will feature bonus and unreleased tracks. Producers on the album include chart-topping US studio bods Rodney Jerkins, Bangladesh, and Midi Mafia. On 6 September, they premiered the lead single, "Hottest Girl in the World", on BBC Radio 1. The single was released on 21 October and debuted at number 6 on the UK Singles Chart.
Question: What happened in 2011?
Answer: JLS began working on their third album, Jukebox in March 2011.

Problem: Background: Gaelic Ireland (Irish: Eire Ghaidhealach) was the Gaelic political and social order, and associated culture, that existed in Ireland from the prehistoric era until the early 17th century. Before the Norman invasion of 1169, Gaelic Ireland comprised the whole island. Thereafter, it comprised that part of the country not under foreign dominion at a given time. For most of its history, Gaelic Ireland was a "patchwork" hierarchy of territories ruled by a hierarchy of kings or chiefs, who were elected through tanistry.
Context: For most of the Gaelic period, dwellings and farm buildings were circular with conical thatched roofs (see roundhouse). Square and rectangle-shaped buildings gradually became more common, and by the 14th or 15th century they had replaced round buildings completely. In some areas, buildings were made mostly of stone. In others, they were built of timber, wattle and daub, or a mix of materials. Most ancient and early medieval stone buildings were of dry stone construction. Some buildings would have had glass windows. Among the wealthy, it was common for women to have their own 'apartment' called a grianan (anglicized "greenan") in the sunniest part of the homestead.  The dwellings of freemen and their families were often surrounded by a circular rampart called a "ringfort". There are two main kinds of ringfort. The rath is an earthen ringfort, averaging 30m diameter, with a dry outside ditch. The cathair or caiseal is a stone ringfort. The ringfort would typically have enclosed the family home, small farm buildings or workshops, and animal pens. Most date to the period 500-1000 CE and there is evidence of large-scale ringfort desertion at the end of the first millennium. The remains of between 30,000 and 40,000 lasted into the 19th century to be mapped by Ordnance Survey Ireland. Another kind of native dwelling was the crannog, which were roundhouses built on artificial islands in lakes.  There were very few nucleated settlements in Gaelic areas. However, after the 5th century some monasteries became the heart of small "monastic towns". By the 10th century the Norse-Gaelic ports of Dublin, Wexford, Cork and Limerick had grown into substantial settlements. It was at this time, perhaps as a response to Viking raids, that many of the Irish round towers were built.  In the fifty years before the Norman invasion, the term "castle" (Old Irish: caistel/caislen) appears in Gaelic writings, although there are no surviving examples of pre-Norman castles. After the invasion, the Normans built motte-and-bailey castles in the areas they occupied, some of which were converted from ringforts. By 1300 "some mottes, especially in frontier areas, had almost certainly been built by the Gaelic Irish in imitation". The Normans gradually replaced wooden motte-and-baileys with stone castles and tower houses. Tower houses are free-standing multi-storey stone towers usually surrounded by a wall (see bawn) and ancillary buildings. Gaelic families had begun to build their own tower houses by the 15th century. As many as 7000 may have been built, but they were rare in areas with little Norman settlement or contact. They are concentrated in counties Limerick and Clare but are lacking in Ulster, except the area around Strangford Lough.  In Gaelic law, a 'sanctuary' called a maighin digona surrounded each person's dwelling. The maighin digona's size varied according to the owner's rank. In the case of a boaire it stretched as far as he, while sitting at his house, could cast a cnairsech (variously described as a spear or sledgehammer). The owner of a maighin digona could offer its protection to someone fleeing from pursuers, who would then have to bring that person to justice by lawful means.
Question: What did they replaced the round buildings with ?
Answer:
Square and rectangle-shaped buildings