After the A-lister repeatedly got "cold feet", James was left pleading his case over email.
Who knew the Beatles star was such a talented impressionist?
The Gerry And The Pacemakers frontman died on Sunday at the age of 78.
The Beatle also discussed a certain Taylor Swift secret sure to make any Swiftie jealous.
John's wife Yoko Ono also shared a video of New York's Empire State Building lit up in his honour.
The Late Late Show host took aim at the US president with the help of a Paul McCartney classic.
Taylor Swift, Paul McCartney, Diana Ross and Lana Del Rey were all due to perform at Worthy Farm in Somerset.
The former Beatles star will return to the iconic music festival next year to play for a second time.
Mick Jagger And Paul McCartney Lead Tributes To Legendary Drummer Ginger Baker After His Death, Aged 80
The former Cream and Blind Faith player died on Sunday, his daughter confirmed.
The pair attended school together in Liverpool in the 1950s and had kept in touch over the years.