On April 10th 2020, it will be exactly 50 years since Paul McCartney announced the break-up of the Beatles. At that point, we will be at the same distance in time from 1970 as 1970 was from 1920, the year Al Jolson's 'Swanee' was the bestselling record and Gustav Holst composed The Planets.

The Beatles continue to occupy a position unique in popular culture. They have entered people's minds in a way that did not occur before, and has not occurred since. Their influence extended way beyond the realm of music to fashion, politics, class, religion and ethics. Countless books have doggedly catalogued the minutiae of The Beatles. If you want to know the make of George Harrison's first car you will always be able to find the answer (a second hand, two-door, blue Ford Anglia 105E Deluxe, purchased from Brian Epstein's friend Terry Doran, who worked at a dealership in Warrington). Before she met John Lennon, who was the only Beatle Yoko Ono could name, and why? Ringo. Because 'ringo' means 'apple' in Japanese. All very interesting, but there is, as yet, no book about The Beatles that combines the intriguing minutiae of their day-to-day lives with broader questions about their effect - complicated and fascinating - on the world around them, their contemporaries, and generations to come.