In 1957 John Lennon and Paul McCartney were two ordinary teenagers who met in suburban Liverpool and decided to play rock and roll together. Twenty-three years later that friendship came to a tragic end when Lennon was murdered. But those 23 years changed the world. Lennon and McCartney became global stars, created a body of work that has never been matched in popular music, and arguably had more influence on our culture than any other figures in the past century. 

In June 2025 writer Ian Leslie returns to Intelligence Squared to tell a new history of the world’s most influential creative relationship and explain why Lennon and McCartney were a combination of friends, rivals and collaborators. Drawing from his new book John and Paul: A Love Story in Songs, Leslie will explore how both Beatles had the fabric of their world ruptured at a young age, and longed to make emotional connections – with each other, and with audiences. The pop song was a vessel into which they poured feelings of grief and euphoria and everything in between. When they couldn’t speak what they felt, they sang it. After the break-up of their group, they maintained a musical dialogue at a distance, in songs full of recrimination, regret, and affection.

Leslie will trace the twists and turns of the Lennon/McCartney relationship through the music it produced and the huge impact it still has on the world today.