Sir Paul McCartney says memories of The Beatles first US tour came flooding back to him during his recent appearance at the Shea Stadium in New York.

McCartney was a surprise special guest during Billy Joel's concert at the Stadium on July 18th, performing the Beatles tracks 'I Saw Her Standing There' and 'Let It Be'.

"Standing out there on stage and hearing the crowd, all the memories came flooding back of being there all that time ago with the band when we first toured the US," he said.

McCartney revealed that the band didn't know what to expect when they first performed there because “no-one had ever played a stadium show before.”

“Like a lot of things we did, it was going into the unknown,” he said.

The former Beatle also spoke about his journey to the stadium, which involved a 15-minute police escort across New York.

“When the plane doors opened I was met by the police and airport security, who rushed me straight through all the arrival procedures and then got me out as quickly as possible,” he said.

Joel's concert was the last to take place at the stadium.

(by Jason Gregory)