Book excerpt: The Beatles brought colour, joy, freedom and love to a grey, post-war world. But the most successful group in popular music history also harboured hidden, sometimes darker worlds and influences that are often downplayed by their biographers. In their career, the Fab Four were to cross paths with many spiritual movements, religious groups, esoteric philosophies and mystical teachings. Inevitably, their thinking was affected by the ideas they encountered. These ideas in turn helped shape their music and – given their vast popularity – the public consciousness. Behind the Wall of Illusion examines the spiritual inspirations that the Beatles brought to the changing cultural landscape of the 1960s. From the popularization of the new religion of rock 'n' roll, Beatlemania (the 'new Cult of Dionysus') and John Lennon's explosive statement that the Beatles were 'bigger than Jesus', Sean MacLeod takes us on a tour of Indian ashrams, questionable gurus and hallucinatory drugs. He also studies the secreted 'clues' in the Beatles' album covers and films; the growing rumours that Paul had been killed in a car crash and covertly replaced; and the tragic assassination of John Lennon and the unknown perpetrators behind the crime. This is an indispensable book for any lover of the Beatles.