He said: "I'm in Liverpool, and I need your help".
Paul McCartney took the driver's seat - and the passenger seat - in the latest installment of "Carpool Karaoke", which aired as part of "The Late Late Show with James Corden", which is airing this week from London.
The video wraps up with a surprise for local pub patrons, who are treated to a mini McCartney concert ending with a rousing "Hey Jude" singalong.
He added: "She gave me the positive word".
All the while, the two sing some of the Beatles' biggest hits, such as "When I'm Sixty-Four", "Blackbird", and "A Hard Day's Night", as well as "Come On to Me", one of Paul's two new songs, released just last June 20, from his new album Egypt Station.
"Your music is so full of positivity and joy and a message of love and togetherness", Corden told the celebrated singer. The only problem is that Grohl isn't much of a piano player, and the famously leftie McCartney only had left handed guitars laying about, which were no use to the right-handed Foo Fighter.
McCartney then explained the origins "Let It Be". Oh, and a little song called "Let It Be".
Corden labelled it "the most lovely story" he has ever heard, before the pair perform a version of it.
McCartney made the emotional moment even more poignant when he reassuringly told Corden, "He is". "I didn't see that one coming around the corner", he said as he wiped tears from his eyes.
As they made their way down the road, the song began to play on the radio and the former Beatle sang along before they left the auto and the singer signed his autograph on the road sign.