Mona Best opened the Casbah Coffee Club with a performance by the Quarrymen, the precursor of the Beatles.

Alice Mona Best was a British music club proprietor, best known as the owner of The Casbah Coffee Club, a club in Liverpool which served as a venue for rock and roll music during the late 1950s and 1960s. Among the bands to play at The Casbah was the Beatles, for whom her son Pete Best was a drummer at the time. Mona Best also had two other sons, John Rory, and Vincent "Roag" Best. It was later confirmed that Roag's father was Beatles' associate, music executive Neil Aspinall, although he was not registered as the father on Roag's birth certificate.

The Casbah Coffee Club, officially Casbah Club, was a rock and roll music venue in the West Derby area of Liverpool, England, that operated from 1959 to 1962. Started by Mona Best, mother of early Beatles drummer Pete Best, in the cellar of the family home, the Casbah was planned as a members-only club for her sons Pete and Rory and their friends, to meet and listen to the popular music of the day. Mona came up with the idea of the club after watching a TV report about the 2i's Coffee Bar in London's Soho where several singers had been discovered.

The Quarrymen are a British skiffle and rock and roll group, formed by John Lennon in Liverpool in 1956, which evolved into the Beatles in 1960. Originally consisting of Lennon and several school friends, the Quarrymen took their name from a line in the school song of their school, the Quarry Bank High School. Lennon's mother, Julia, taught her son to play the banjo, showed Lennon and Eric Griffiths how to tune their guitars in a similar way to the banjo, and taught them simple chords and songs.

The Beatles were an English rock band formed in Liverpool in 1960. The core lineup of the band comprised John Lennon, Paul McCartney, George Harrison and Ringo Starr. They are widely regarded as the most influential band in Western popular music and were integral to the development of 1960s counterculture and the recognition of popular music as an art form. Rooted in skiffle, beat and 1950s rock 'n' roll, their sound incorporated elements of classical music and traditional pop in innovative ways. The band also explored music styles ranging from folk and Indian music to psychedelia and hard rock. As pioneers in recording, songwriting and artistic presentation, the Beatles revolutionised many aspects of the music industry and were often publicised as leaders of the era's youth and sociocultural movements.