The Beatles was a popular band that promoted peace in the 1960s and 1970s. They were one of the most popular bands in the world. It seems that everyone has heard of the Beatles. This band included John Lennon, Paul McCartney, Ringo Starr and George Harrison. It seems logical that they would be friends because they were playing in the same band for such a long period of time.
However, sometimes when bands start to become famous, their agent or label may require them to include other members. In this case, John Lennon and Paul McCartney were the first two Beatles who actually belonged to another band when they were fifteen and sixteen years old. At this age, they were probably friends and continued to be friends for a long time.
I think John Lennon and Paul McCartney really were best friends, or at least close friends. Some people might think it was a facade to sell records, but they could have sold records either way. Their music was really loved by many people, no matter what kind of relationship members of the band had with each other.
John Lennon and Paul McCartney were also friends long after the Beatles were no longer making music, so this is proof they at least liked each other a lot.