Problem: Background: Roger Keith "Syd" Barrett (6 January 1946 - 7 July 2006) was an English singer, songwriter, musician, composer, and painter. Best known as a founder member of the band Pink Floyd, Barrett was the lead singer, guitarist and principal songwriter in its early years and is credited with naming the band. Barrett was excluded from Pink Floyd in April 1968 after David Gilmour took over as their new guitarist, and was briefly hospitalised amid speculation of mental illness. Barrett was musically active for less than ten years.
Context: While Pink Floyd began by playing cover versions of American R&B songs, by 1966 they had carved out their own style of improvised rock and roll, which drew as much from improvised jazz. After Bob Klose departed from the band, the band's direction changed. However, the change was not instantaneous, with more improvising on the guitars and keyboards. Mason reflected, "It always felt to me that most of the ideas were emanating from Syd at the time." At this time, Barrett's reading reputedly included: Grimm's Fairy Tales, Tolkien's The Hobbit and Lord of the Rings, Carlos Castaneda's The Teachings of Don Juan, and The I-Ching. During this period, Barrett wrote most of the songs for Pink Floyd's first album, and also songs that would later appear on his solo albums. In 1966, a new rock concert venue, the UFO (pronounced as "you-foe"), opened in London and quickly became a haven for British psychedelic music. Pink Floyd, the house band, was its most popular attraction and after making appearances at the rival Roundhouse, became the most popular musical group of the "London Underground" psychedelic music scene. By the end of 1966, Pink Floyd had gained a reliable management team in Andrew King and Peter Jenner. Towards the end of October 1966, Pink Floyd, with King and Jenner, set up Blackhill Enterprises, to manage the group's finances. Blackhill was staffed by lodgers Jenner found in his Edbrooke Road house, and among others, Barrett's flatmate, Peter Wynne Wilson (who became road manager, however, since he had more experience in lighting, he was also lighting assistant). King and Jenner wanted to prepare some demo recordings for a possible record deal, so at the end of October, they booked a session at Thompson Private Recording Studio, in Hemel Hempstead. King said of the demos: "That was the first time I realised they were going to write all their own material, Syd just turned into a songwriter, it seemed like overnight." King and Jenner befriended American expatriate Joe Boyd, the promoter of the UFO Club, who was making a name for himself as one of the more important entrepreneurs on the British music scene. The newly hired booking agent, Bryan Morrison, and Boyd had proposed sending in better quality recordings. From Morrison's agency the band played a gig outside London for the first time. In November, the band performed the first (of many) strangely named concerts: Philadelic Music for Simian Hominids, a multimedia event arranged by the group's former landlord, Mike Leonard, at Hornsey College of Art. They performed at the Free School for the following two weeks, before performing at the Psychodelphia Versus Ian Smith event at the Roundhouse in December, arranged by the Majority Rule for Rhodesia Campaign, and an Oxfam benefit at the Albert Hall (the band's biggest venue up to this point).
Question: What did he do in London Underground?
Answer: became the most popular musical group of the "London Underground" psychedelic music scene.

Problem: Background: Gustaf V was born in Drottningholm Palace in Ekero, Stockholm County, the son of Prince Oscar and Princess Sofia of Nassau. At birth Gustaf was created Duke of Varmland. Upon his father's accession to the throne in 1872, Gustaf became crown prince of both Sweden and Norway. On 8 December 1907, he succeeded his father on the Swedish throne, which had been separated from the Norwegian throne two years earlier.
Context: When he ascended the throne, Gustaf V was, at least on paper, a near-autocrat. The 1809 Instrument of Government made the king both head of state and head of government, and ministers were solely responsible to him. However, his father had been forced to accept a government chosen by the majority in Parliament in 1905. Since then, prime ministers had been chosen according to parliamentary support. At first, Gustaf V seemed to be willing to accept parliamentary rule. After the Liberals won a massive landslide in 1911, Gustaf appointed Liberal leader Karl Staaff as Prime Minister. However, during the runup to World War I, the elites objected to Staaff's defence policy. In February 1914, a large crowd of farmers gathered at the royal palace and demanded that the country's defences be strengthened. In his reply, the so-called Courtyard Speech--which was actually written by explorer Sven Hedin, an ardent conservative--Gustaf promised to strengthen the country's defences. Staaff was outraged, telling the king parliamentary rule called for the Crown to stay out of partisan politics. He was also angered that he had not been consulted in advance of the speech. However, Gustaf retorted that he still had the right to "communicate freely with the Swedish people." The Staaff government resigned in protest, and Gustaf appointed a government of civil servants headed by Hjalmar Hammarskjold (father of Dag Hammarskjold) in its place. To date, it is the last time that a Swedish king directly intervened in the governing of the country. The 1917 elections showed a heavy gain for the Liberals and Social Democrats. Despite this, Gustaf initially tried to appoint a Conservative government headed by Johan Widen. However, Widen was unable to form a coalition. It was now apparent that Gustaf could no longer appoint a government entirely of his own choosing, nor could he keep a government in office against the will of Parliament. With no choice but to appoint a Liberal as prime minister, he appointed a Liberal-Social Democratic coalition government headed by Staaff's successor as Liberal leader, Nils Eden. The Eden government promptly arrogated most of the king's political powers to itself and enacted numerous reforms, most notably the institution of complete (male and female) universal suffrage in 1918-1919. While Gustaf still formally appointed the ministers, they now had to have the confidence of Parliament. He was now also bound to act on the ministers' advice. Although the provision in the Instrument of Government stating that "the King alone shall govern the realm" remained unchanged, for all intents and purposes the ministers did the actual governing. Gustaf accepted his reduced role, and reigned for the rest of his life as a model limited constitutional monarch. Parliamentarianism had become a de facto reality in Sweden, even if it would not be formalized until 1974. Gustaf V was considered to have German sympathies during World War I. His political stance during the war was highly influenced by his wife, who felt a strong connection to her German homeland. On 18 December 1914, he sponsored a meeting in Malmo with the other two kings of Scandinavia to demonstrate unity. Another of Gustaf V's objectives was to dispel suspicions that he wanted to bring Sweden into the war on Germany's side.
Question: What was the result?
Answer:
Since then, prime ministers had been chosen according to parliamentary support.