I'm joined for my latest episode by John F. Lyons. His book 'Joy and Fear' is a riveting look at the polarizing nature of the Beatles phenomenon, and how it transformed a generation, through the lens of a singular city in the centre of America. Drawing on historical and contemporary accounts, Joy and Fear brings to life the frenzied excitement of Beatlemania in 1960s Chicago, while also illustrating the deep-seated hostility from the establishment toward the Beatles. You can follow John on Twitter @JohnFLyons2