Problem: Background: The Beatles were an English rock band formed in Liverpool in 1960. With members John Lennon, Paul McCartney, George Harrison and Ringo Starr, they became widely regarded as the foremost and most influential music band. Rooted in skiffle, beat and 1950s rock and roll, the Beatles later experimented with several musical styles, ranging from pop ballads and Indian music to psychedelia and hard rock, often incorporating classical elements and unconventional recording techniques in innovative ways. In 1963 their enormous popularity first emerged as "Beatlemania"; as the group's music grew in sophistication, led by primary songwriters Lennon and McCartney, the band were integral to pop music's evolution into an art form and to the development of the counterculture of the 1960s.
Context: In Icons of Rock: An Encyclopedia of the Legends Who Changed Music Forever, Scott Schinder and Andy Schwartz describe the Beatles' musical evolution:  In their initial incarnation as cheerful, wisecracking moptops, the Fab Four revolutionised the sound, style, and attitude of popular music and opened rock and roll's doors to a tidal wave of British rock acts. Their initial impact would have been enough to establish the Beatles as one of their era's most influential cultural forces, but they didn't stop there. Although their initial style was a highly original, irresistibly catchy synthesis of early American rock and roll and R&B, the Beatles spent the rest of the 1960s expanding rock's stylistic frontiers, consistently staking out new musical territory on each release. The band's increasingly sophisticated experimentation encompassed a variety of genres, including folk-rock, country, psychedelia, and baroque pop, without sacrificing the effortless mass appeal of their early work.  In The Beatles as Musicians, Walter Everett describes Lennon and McCartney's contrasting motivations and approaches to composition: "McCartney may be said to have constantly developed - as a means to entertain - a focused musical talent with an ear for counterpoint and other aspects of craft in the demonstration of a universally agreed-upon common language that he did much to enrich. Conversely, Lennon's mature music is best appreciated as the daring product of a largely unconscious, searching but undisciplined artistic sensibility."  Ian MacDonald describes McCartney as "a natural melodist - a creator of tunes capable of existing apart from their harmony". His melody lines are characterised as primarily "vertical", employing wide, consonant intervals which express his "extrovert energy and optimism". Conversely, Lennon's "sedentary, ironic personality" is reflected in a "horizontal" approach featuring minimal, dissonant intervals and repetitive melodies which rely on their harmonic accompaniment for interest: "Basically a realist, he instinctively kept his melodies close to the rhythms and cadences of speech, colouring his lyrics with bluesy tone and harmony rather than creating tunes that made striking shapes of their own." MacDonald praises Harrison's lead guitar work for the role his "characterful lines and textural colourings" play in supporting Lennon and McCartney's parts, and describes Starr as "the father of modern pop/rock drumming".
Question: Why did they revolutionize the sound of rock and roll?
Answer: 

Background: Larsson was born in Helsingborg, Scania. His father, Francisco Rocha, is from Cape Verde, and his mother, Eva Larsson, is Swedish. His parents, who never married and split up when he was 12, decided that he should take his mother's surname because they felt it would make it easier for their son to be accepted in Sweden. He credits his father for his love of football.
Context: At the end of the 2003-04 season, Larsson left Celtic on a free transfer and signed a one-year contract with Barcelona with an option for a second year. Larsson's contribution in Barca's La Liga win in his first season there was disrupted by serious injury. He scored 3 goals in 12 Liga games and one goal (against his former club Celtic) in four Champions League matches. After the match against Celtic, he said: "It was very difficult for me to celebrate my goal because I had so many great times here." On 20 November 2004, during the 3-0 victory in El Clasico against Real Madrid, Larsson tore the anterior cruciate ligament (ACL) and meniscus in his left knee. Despite his injury-hit 2004-05 season, playing only 16 games, Barcelona took the option to extend his contract.  In December 2005, Larsson announced that at the end of his contract, which ended in July, he would leave Barcelona and return to Sweden to end his career. He revealed that he had refused an offer by club president Joan Laporta to extend his contract to the end of the next season. On the announcement of his departure, Ronaldinho said:  In Larsson's final match for Barcelona, his substitute introduction was pivotal to win the 2006 Champions League final. Larsson assisted both of Barcelona's goals in a 2-1 win over Arsenal. Thierry Henry paid tribute to Larsson's contribution to Barcelona's win after the match, saying, "People always talk about Ronaldinho, Samuel Eto'o, Ludovic Giuly and everything, but I didn't see them today, I saw Henrik Larsson. He came on, he changed the game, that is what killed the game. Sometimes you talk about Ronaldinho and Eto'o and people like that; you need to talk about the proper footballer who made the difference, and that was Henrik Larsson tonight." Indeed, his ability to give Barcelona the cutting edge required to overcome Arsenal was noted by the international press. In 2005-06, Larsson scored ten goals as Barcelona won La Liga for a second consecutive year.
Question: Are there any other interesting aspects about this article?
Answer:
Thierry Henry paid tribute to Larsson's contribution to Barcelona's win after the match,