input: The four-piece band is the most common configuration in rock and pop music. Another common formation was a vocalist, electric guitarist, bass guitarist, and a drummer (e.g. The Who, The Monkees, Led Zeppelin, Queen, Ramones, Sex Pistols, Red Hot Chili Peppers, R.E.M., Blur, The Smiths, Echo and the Bunnymen, The Stone Roses, Creed, Black Sabbath, Van Halen, Rage Against the Machine, Gym Class Heroes, The Stooges, Joy Division, and U2.) Instrumentally, these bands can be considered as trios. This format is popular with new bands, as there are only two instruments that need tuning, the melody and chords formula prevalent with their material is easy to learn, four members are commonplace to work with, the roles are clearly defined and generally are: instrumental melody line, rhythm section which plays the chords or countermelody, and vocals on top. In some early rock bands, keyboardists were used, performing on piano (e.g. The Seeds and The Doors) with a guitarist, singer, drummer and keyboardist. Some bands will have a guitarist, bassist, drummer, and keyboard player (for example, Talking Heads, Gerry and the Pacemakers, Small Faces, King Crimson, The Guess Who, Pink Floyd, Queen, Coldplay, The Killers and Blind Faith). Some bands will have the bassist on lead vocals, such as Thin Lizzy, The Chameleons, Skillet, Pink Floyd, Motorhead, NOFX, +44, Slayer, The All-American Rejects or even the lead guitarist, such as Death, Dire Straits, Megadeth and Creedence Clearwater Revival. Some bands, such as The Beatles, have a lead guitarist, a rhythm guitarist and a bassist that all sing lead and backing vocals, that also play keyboards regularly, as well as a drummer.

Answer this question "what four roles are there?"
output: a vocalist, electric guitarist, bass guitarist, and a drummer

input: Whilst the Evans brothers were at Mount Temple Comprehensive School in Dublin in 1976, they went along to a meeting in response to an advert posted by another pupil, Larry Mullen Jr., on the school's noticeboard seeking musicians to form a new band with him. Among the several other pupils who also responded to the note were Paul Hewson and Adam Clayton. The band went through a number of reformations before becoming known as U2 in March 1978 (Richard Evans having left before this to join another band, leaving his younger brother as the lead guitarist). Early in the band's career, Evans was given the name 'The Edge' by Bono. According to fan site atU2.com, "The nickname was inspired in the beginning by the sharp features of his face, but it also applied to his sharp mind and the way he always observed things from the edge." However, the origin of the name is disputed and other theories include a description of his guitar playing and his preference for not becoming fully involved and therefore remaining on the edge of things. U2 began its public performance life in small venues in Dublin in 1977, occasionally playing at other venues elsewhere in Ireland. In December 1979 they performed their first concerts outside Ireland, in London, and in 1980 began extensive touring across the British Isles, developing a following. Their debut album Boy was released in 1980. In 1981, leading up to the October Tour, Evans came very close to leaving U2 for religious reasons, but he decided to stay. During this period he became involved with a group called Shalom Tigers, in which bandmates Bono and Larry Mullen Jr. were also involved. Shortly after deciding to remain with the band, he wrote a piece of music that later became "Sunday Bloody Sunday".

Answer this question "Did they collaborate with U2?"
output: The band went through a number of reformations before becoming known as U2 in March 1978

input: During his 16-year NBA career, Barkley was regarded as one of the most controversial, outspoken and dominating players in the history of basketball. His impact on the sport went beyond his rebounding titles, assists, scoring and physical play. His confrontational mannerisms often led to technical fouls and fines on the court, and his larger than life persona sometimes gave rise to national controversy off of it, such as when he was featured in ads that rejected pro athletes as role models and declared, "I am not a role model." Although his words often led to controversy, according to Barkley his mouth was never the cause because it always spoke the truth. He stated, "I don't create controversies. They're there long before I open my mouth. I just bring them to your attention." Besides his on-court fights with other players, he has exhibited confrontational behavior off-court. He was arrested for breaking a man's nose during a fight after a game with the Milwaukee Bucks and also for throwing a man through a plate-glass window after being struck with a glass of ice. Barkley continues to be popular with the fans and media because of his sense of humor and honesty. As a player, Barkley was a perennial All-Star who earned league MVP honors in 1993. He employed a physical style of play that earned him the nicknames "Sir Charles" and "The Round Mound of Rebound". He was named to the All-NBA team eleven times and earned two gold medals as a member of the United States Olympic Basketball team. He led both teams in scoring and was instrumental in helping the 1992 "Dream Team" and 1996 Men's Basketball team compile a perfect 16-0 record. He retired as one of only four players in NBA history to record at least 20,000 points, 10,000 rebounds and 4,000 assists in their career, In recognition of his collegiate and NBA achievements, Barkley's number 34 jersey was officially retired by Auburn University on March 3, 2001. In the same month, the Philadelphia 76ers also officially retired Barkley's jersey. On March 20, 2004, the Phoenix Suns honored Barkley as well by retiring his jersey including him in the "Suns Ring of Honor". In recognition of his achievements as a player, Barkley was inducted into the Naismith Memorial Basketball Hall of Fame in 2006.

Answer this question "went beyond what?"
output:
His impact on the sport went beyond his rebounding titles, assists, scoring and physical play. His confrontational mannerisms often led to technical fouls