There were sing-alongs of course, but it was the rendition of "Let It Be" that literally moved Corden to tears, as the host recounted how his father and grandfather sat him down and first introduced him to the song and, by extension, The Beatles.
As their journey continued, McCartney shared the story behind the making of that tune and others, like the early hit "She Loves You"; gave Corden a tour of the home where he wrote numerous early Beatles tunes with John Lennon; and eventually surprised some unsuspecting pub customers with a live concert and emotional rendition of "Hey Jude".
The segment climaxed with Paul returning to one of the pubs Paul used to play before The Beatles hit the big-time, surprising the locals with a performance with his current band - singing hits decided by the audience via a jukebox. "I'll never ever forget it".
Prince Louis to be baptised on July 9
According to Fitzwilliams, Prince Harry and Markle's attendance in the event is already a representation for the royal family. The good news for his football-loving dad, Prince William , is that 9 July is one of the rest days in the World Cup.
He played A Hard Day's Night, Love Me Do, Back In The USSR and Hey Jude as members of the audience cried.
They sing the song and Corden can not contain his emotion. "If my granddad were here right now, he'd get an absolute kick out of this".
"That's been one of the unusual things", McCartney, around the five-minute mark in the video up top, told Corden of the lasting impact of the Beatles' message.