The Beatles 

were an English rock band, formed in Liverpool in 1960, and one of the most commercially successful and critically acclaimed acts in the history of popular music. From 1962, the group consisted of John Lennon(rhythm guitar, vocals), Paul McCartney (bass guitar, vocals), George Harrison (lead guitar, vocals) and Ringo Starr(drums, vocals). Rooted in skiffle and 1950s rock and roll, the group later worked in many genres ranging from popballads to psychedelic rock, often incorporating classical and other elements in innovative ways. The nature of their enormous popularity, which first emerged as the "Beatlemania" fad, transformed as their songwriting grew in sophistication. The group came to be perceived as the embodiment of progressive ideals, seeing their influence extend into the social and cultural revolutions of the 1960s.

Initially with a five-piece line-up of Lennon, McCartney, Harrison, Stuart Sutcliffe (bass) and Pete Best (drums), The Beatles built their reputation in Liverpool and Hamburg clubs over a three-year period from 1960. Sutcliffe left the group in 1961, and Best was replaced by Starr the following year. Moulded into a professional outfit by music store ownerBrian Epstein after he offered to act as the group's manager, and with their musical potential enhanced by the creativity of producer George Martin, The Beatles achieved mainstream success in the United Kingdom in late 1962 with their first single, "Love Me Do". Gaining international popularity over the course of the next year, they toured extensively until 1966, then retreated to the recording studio until their break-up in 1970. Each then found success in an independent musical career. Lennon was murdered outside his home in New York City in 1980, and Harrison died of cancer in 2001. McCartney and Starr remain active.

During their studio years, The Beatles produced what critics consider some of their finest material including the albumSgt. Pepper's Lonely Hearts Club Band (1967), widely regarded as a masterpiece. Four decades after their break-up, The Beatles' music continues to be popular. The Beatles have had more number one albums on the UK charts, and held down the top spot longer, than any other musical act. According to the RIAA, they have sold more albums in the United States than any other artist. In 2008, Billboard magazine released a list of the all-time top-selling Hot 100artists to celebrate the US singles chart's fiftieth anniversary, with The Beatles at number one. They have been honoured with 7 Grammy Awards, and they have received 15 Ivor Novello Awards from the British Academy of Songwriters, Composers and Authors. The Beatles were collectively included in Time magazine's compilation of the 20th century's 100 most influential people.

Paul McCartney.:

 MBE (born 18 June 1942) is an English musician, singer-songwriter, composer and painter. Formerly of The Beatles (1960–1970) and Wings (1971–1981), McCartney is the most commercially successful songwriter in the history of popular music, according to 

Guinness World Records.

McCartney gained worldwide fame as a member of The Beatles, alongside 

George Harrison, and Ringo Starr. McCartney and Lennon formed one of the most influential and successful songwriting partnerships and wrote some of the most popular songs in the history of rock music. After leaving The Beatles, McCartney launched a successful solo career and formed the band Wings with his first wife, Linda Eastman, and singer-songwriter Denny Laine. McCartney is listed in Guinness World Records as the "most successful musician and composer in popular music history", with 60 gold discs and sales of 100 million singles in the UK.

John Lennon

.:

 MBE (9 October 1940 – 8 December 1980) was an English musician and singer-songwriter who rose to worldwide fame as one of the founding members of The Beatles, one of the most commercially successful and critically acclaimed acts in the history of popular music. Along with fellow Beatle Paul McCartney, he formed one of the most successful songwriting partnerships of the 20th century.

Born and raised in Liverpool, Lennon became involved as a teenager in the skiffle craze; his first band, The Quarrymen, evolved into The Beatles in 1960. As the group disintegrated towards the end of the decade, Lennon embarked on a solo career that produced the critically acclaimed albums John Lennon/Plastic Ono Band and Imagine, and iconic songs such as "Give Peace a Chance" and "Imagine". Lennon disengaged himself from the music business in 1975 to devote time to his family, but re-emerged in 1980 with a new album, Double Fantasy. He was murdered three weeks after its release.

Lennon revealed a rebellious nature and acerbic wit in his music, his writing, his drawings, on film, and in interviews, and he became controversial through his political activism. He moved to New York City in 1971, where his criticism of the Vietnam War resulted in a lengthy attempt by Richard Nixon's administration to deport him, while his songs were adopted as anthems by the anti-war movement.

As of 2010, Lennon's solo album sales in the United States exceed 14 million units, and as writer, co-writer or performer, he is responsible for 27 number-one singles on the US Hot 100 chart. In 2002, a BBC poll on the 100 Greatest Britons voted him eighth, and in 2008, Rolling Stone ranked him the fifth-greatest singer of all-time. He was posthumously inducted into the Songwriters Hall of Fame in 1987 and into the Rock and Roll Hall of Fame in 1994.