In 1963, it was unusual for a pop group to have a monthly magazine devoted exclusively to their career. Only Elvis Presley had been considered important enough to warrant such an honour. But then the Beatles were unusual. Within the space of that pivotal year, the Fab Four became the biggest thing in British popular culture and their worldwide fame was soon inescapable. One of the first to astutely recognise their greatness was Sean O'Mahony and the...