The Beatles were an English rock band, originally from Liverpool and active from 1960 to 1970. The lineup marked an era in music, costume, fashion and pop art. Considered a mass communication phenomenon of global proportions, several decades after their official dissolution - and after the death of two of the four members - the Beatles still have a huge following and numerous are their fan clubs existing in every part of the world. world. According to a 2001 estimate, it was by far the most commercially successful musical group, with total sales exceeding one billion records and cassettes, and for Rolling Stone magazine the Beatles are the greatest artists of all time. The aura that surrounds the development of their media success and which has favored the birth of the so-called Beatlemania and the extraordinary artistic success achieved as rock musicians are also the subject of study by universities, psychologists and professionals in the sector.