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Paul McCartney takes a trip down memory (and Penny) lane in latest "Carpool Karaoke"

Craig Sugden/CBS The Late Late Show has gone full Beatlemania. 

Closing out his week in London, James Corden gave music legend and former Beatles member Paul McCartney a ticket to ride with him for the latest "Carpool Karaoke," with the two taking a trip down memory lane through McCartney's Liverpool hometown.

Their first stop was on Penny Lane itself, where the pair sang "Penny Lane" and then got out of the car to visit popular stops along the street -- even the barbershop that's mentioned in the song, where there was a framed photo on the wall of John Lennon giving McCartney a haircut during their Fab Four days.

The car ride took an emotional turn when they started singing "Let it Be." Corden, moved to tears, recalled that it was one of his late grandfather's favorite songs. 

"That's the power of music," McCartney said. 

The two then visited the house in which McCartney lived when he and John Lennon wrote some of the band's first songs. Inside, McCartney explained he wrote a lot of music in "the bog" -- Brit slang for bathroom -- because of the great acoustics. He also explained that this father wanted them to change "She loves you yeah, yeah, yeah" to "She loves you yes, yes, yes" to avoid "Americanisms." 

After a quick bit back in the car during which Corden briefly dressed up in all the staple Beatles looks, they arrived at the Philarmonic, a pub that the Beatles used to perform at when they first started. Corden told the locals to put a coin in the jukebox and select a Beatles song. When they did, the stage curtain opened and there was McCartney and his band. They performed "Hard Day's Night, "Ob-La-Di, Ob-La-Da," "Love Me Do" and "Back in the U.S.S.R." as the delighted patrons danced and sang along.

McCartney then invited Corden on the stage to sing "Hey Jude" together, which became a moving performance for everyone. 

McCartney's latest album, Egypt Station, drops September 7. His first singles from the album, "I Don't Know" and "Come On to Me," are available now.

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