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LOS ANGELES, CA - FEBRUARY 10: Musicians Dave Grohl (L) and Sir Paul McCartney perform onstage at the 2012 MusiCares Person of the Year Tribute to Paul McCartney held at the Los Angeles Convention Center on February 10, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - FEBRUARY 10:  Musicians Dave Grohl (L) and Sir Paul McCartney perform onstage at the 2012 MusiCares Person of the Year Tribute to Paul McCartney held at the Los Angeles Convention Center on February 10, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
Dave Grohl and Paul McCartney performed at the 2012 MusiCares Person of the Year Tribute to McCartney in Los Angeles, CA. (Getty Images)

The audience at London’s O2 Arena signed up to see the Beatles’ Sir Paul McCartney perform classic Beatles songs and new material, but the fans soon realized they were in for a treat when Foo Fighters founder Dave Grohl hopped out on stage during the Saturday night (May 23) concert, reports CNN.

Grohl had just performed in NYC on Wednesday night (May 20) during the final episode of Late Night with David Letterman, giving the longtime late night host a proper send-off. Grohl could’ve sat home and had a think about the milestone moment he had just taken part in, but instead he hopped on a plane to London town.

While seeing McCartney live in concert is priceless; the crowd received a two-for-one deal when witnessing the legendary musicians collaborate on stage, performing “I Saw Her Standing There”:

That wasn’t the only surprise, with McCartney debuting the live performance of “Temporary Secretary.”:

The collaboration may have been a surprise for the audience, but these two have a history:

Winners For Best Rock Song Paul McCartney (L) and Dave Grohl (with Krist Novoselic and Pat Smear) give their acceptance speech on stage during the 56th Grammy Awards at the Staples Center in Los Angeles, California, January 26, 2014. AFP PHOTO FREDERIC J. BROWN        (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
McCartney and Grohl accepted a 2014 Grammy for their rock song “Cut Me Some Slack.” (Getty Images)

What did you think of the performances?

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By Brigid Brown