In Peter Jackson’s excellent recent seven-hour three-part TV series for Disney+, Get Back, following a quick sprint through The Beatles’ history in its initial few minutes, we fast forward to 1969, two years after Brian Epstein passed away – and the most classic pop group of all time are still in total disarray. The first two hours of the documentary is a lesson on why every band needs a manager, and how wrong it can go when they don’t.