On a Monday evening in May 1966, Paul McCartney and John Lennon visited a nightclub called Dolly’s in Jermyn Street. The two Beatles were accompanied by two Rolling Stones, Brian Jones and Keith Richards. Already at the club was Bob Dylan, stopping off in London on his European tour. Dylan had first met Lennon and McCartney nearly two years earlier at the Delmonico Hotel in New York. All four Beatles, then in the first flush of American success, had gone to meet him after playing to thousands of screaming teenagers at a tennis stadium in Queen’s. Their fascination with his lyrical and emotional maturity was already showing in their songs. Although Dylan was less likely to admit it, the influence went both ways. Intrigued by the group’s musical sophistication (‘She Loves You’ uses nine chords, ‘Blowin’ in the Wind’ three), he was edging towards a poppier, band-based sound.