Question: What was the name of the manager of both Billy J. Kramer and an English rock  band formed in Liverpool in 1960?

full_context: Document 1: The Beatles in Hamburg: The Beatles members John Lennon, Paul McCartney, George Harrison, Stuart Sutcliffe and Pete Best regularly performed at different clubs in Hamburg, Northern Germany, during the period from August 1960 to December 1962; a chapter in the group's history which honed their performance skills, widened their reputation, and led to their first recording, which brought them to the attention of Brian Epstein.
Document 2: Bad to Me: "Bad to Me" is a song credited to Lennon–McCartney. In late interviews, John Lennon said that he wrote it for Billy J. Kramer with The Dakotas while on holiday in Spain. However, in a 1964 interview he said that he and Paul McCartney wrote it in the back of a van, so Paul contributed to it. Billy J. Kramer with The Dakotas released their recording of the song in 1963 and it became their first number 1 in the UK Singles Chart. Paul McCartney was present during the recording session at Abbey Road Studios. The single would be released in the US the following year, and become a top-ten hit there, reaching number 9. It became one of the first occasions a Lennon–McCartney composition made the US Top 40 recorded by an artist other than the Beatles (the first being "A World Without Love" by Peter & Gordon; another being "Goodbye" by Mary Hopkin).
Document 3: Sgt. Pepper's Lonely Hearts Club Band: Sgt. Pepper's Lonely Hearts Club Band is the eighth studio album by English rock band the Beatles. Released on 26 May 1967 in the United Kingdom and 2 June 1967 in the United States, it was an immediate commercial and critical success, spending 27 weeks at the top of the UK albums chart and 15 weeks at number one in the US. On release, the album was lauded by the vast majority of critics for its innovations in music production, songwriting and graphic design, for bridging a cultural divide between popular music and legitimate art, and for providing a musical representation of its generation and the contemporary counterculture. It won four Grammy Awards in 1968, including Album of the Year, the first rock LP to receive this honour.
Document 4: The Who: The Who are an English rock band that formed in 1964. Their classic line-up consisted of lead singer Roger Daltrey, guitarist and singer Pete Townshend, bass guitarist John Entwistle, and drummer Keith Moon. They are considered one of the most influential rock bands of the 20th century, selling over 100 million records worldwide and holding a reputation for their live shows and studio work.
Document 5: Beatles and Rolling Stones rivalry: "The Beatles" and "The Rolling Stones" were arguably the biggest bands of the 1960s. Both bands started their careers in the early 1960s in the United Kingdom and rose to fame as part of the British invasion. The Beatles rose to fame in the UK in 1963 with their singles "Please Please Me" and 'Love Me Do". After a successful album contract the band decided to leave Liverpool and move to London. The Rolling Stones were a struggling band at the time and the Beatles had become famous as a self contained Rock Band. Original song content was getting tougher to acquire in the United Kingdom so the Rolling Stones were a Rock and Roll Blues cover group. On meeting the Beatles at a London Pub; John Lennon and Paul McCartney agreed to write an original single for the Rolling Stones called "I Wanna Be Your Man". The song gave the Stones their first commercial success and Mick Jagger and Keith Richards began writing as well.
Document 6: Lennon–McCartney: Lennon–McCartney was the songwriting partnership between English musicians John Lennon (9 October 19408 December 1980) and Paul McCartney (born 18 June 1942) of the Beatles. It is one of the best known and most successful musical collaborations in history, with the Beatles selling over 600 million records, tapes and CDs as of 2004. Between 1962 and 1969, the partnership published approximately 180 jointly credited songs, of which the vast majority were recorded by the Beatles, forming the bulk of their catalogue.
Document 7: Billy Preston: William Everett Preston (September 2, 1946 – June 6, 2006) was an American musician whose work included R&B, rock, soul, funk, and gospel. Preston was a top session keyboardist in the 1960s, during which he backed artists such as Little Richard, Sam Cooke, Ray Charles, and the Beatles. He then went on to achieve fame as a solo artist, with hit pop singles including "That's the Way God Planned It", "Outa-Space", "Will It Go Round in Circles", "Space Race", and "Nothing from Nothing". Additionally, Preston co-wrote "You Are So Beautiful", which became a number 5 hit for Joe Cocker; Stephen Stills asked Preston if he could use his phrase "if you can't be with the one you love, love the one you're with" and created the hit song.
Document 8: Music of Liverpool: Liverpool has a lengthy tradition of music both classical and pop. It is well known for The Beatles (who recorded 17 UK and 20 US number-one singles). Its pop and rock music scene has also been important in the development of a number of other bands and artists since the 1950s.
Document 9: Paul McCartney: Sir James Paul McCartney, {'1': ", '2': ", '3': ", '4': "} (born 18 June 1942) is an English singer-songwriter, multi-instrumentalist, and composer. He gained worldwide fame as the bass guitarist and singer for the rock band the Beatles, widely considered the most popular and influential group in the history of pop music. His songwriting partnership with John Lennon is the most celebrated of the post-war era. After the group disbanded in 1970, he pursued a solo career and formed the band Wings with his first wife, Linda, and Denny Laine.
Document 10: Cultural impact of the Beatles: 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 act of the rock era. In the early 1960s, their enormous popularity first emerged as "Beatlemania", but as the group's music grew in sophistication, led by primary songwriters Lennon and McCartney, they came to be perceived as an embodiment of the ideals shared by the counterculture of the 1960s.
Document 11: Billy J. Kramer: William Howard Ashton, (born 19 August 1943), better known by his stage name Billy J. Kramer is an English pop singer. In the 1960s, Kramer was managed by Brian Epstein, who also managed The Beatles, and he recorded several original Lennon and McCartney compositions.
Document 12: Fifth Beatle: The fifth Beatle is an informal title that various commentators in the press and entertainment industry have applied to people who were at one point a member of the Beatles, or who had a strong association with the "Fab Four" (John Lennon, Paul McCartney, George Harrison, and Ringo Starr) during the group's existence. The "fifth Beatle" claims first appeared in the press immediately upon the band's rise to global fame in 1963–64. The members have offered their own beliefs of the "fifth Beatle":
Document 13: Brian Epstein: Brian Samuel Epstein ( ; 19 September 1934 – 27 August 1967) was an English music entrepreneur who managed the Beatles. Epstein first discovered the Beatles in November 1961 during a lunchtime performance at The Cavern Club. He was instantly impressed and saw great potential in the group. Epstein was rejected by nearly all major recording companies in London, until he secured a meeting with George Martin, head of EMI's Parlophone label. In May 1962, Martin agreed to sign the Beatles, partly because of Epstein's conviction that the group would become internationally famous.
Document 14: The Kinks: The Kinks were an English rock band formed in Muswell Hill, North London, in 1964 by brothers Ray and Dave Davies. They are regarded as one of the most important and influential rock bands of the '60s decade. The band emerged during the height of British rhythm and blues and Merseybeat, and were briefly part of the British Invasion of the United States until their touring ban in 1965. Their third single, the Ray Davies-penned "You Really Got Me", became an international hit, topping the charts in the United Kingdom and reaching the Top 10 in the United States. Between the mid-1960s and early 1970s, the group released a string of hit singles; studio albums drew good reviews but sold less than compilations of their singles. Their music was influenced by a wide range of genres, including rhythm and blues, British music hall, folk and country. They gained a reputation for reflecting English culture and lifestyle, fueled by Ray Davies' observational writing style. Albums such as "Face to Face" (1966), "Something Else" (1967), "The Kinks Are the Village Green Preservation Society" (1968), "Arthur" (1969), "Lola Versus Powerman" (1970), "Muswell Hillbillies" (1971), along with their accompanying singles, are considered among the most influential recordings of the period.
Document 15: The Beatles: 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 act of the rock era. 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", and as the group's music grew in sophistication in subsequent years, led by primary songwriters Lennon and McCartney, they came to be perceived as an embodiment of the ideals shared by the counterculture of the 1960s.
ground_truth: Brian Epstein