On Saturday, June 7, Foo Fighters played a show in front of 86,000 fans at London's Wembley Stadium (view the stage in the left). Definitely the most important moment hapened at the end of the concert, during the encore, when Jimmy Page and John Paul Jones joined Dave Grohl & Co. for the performance of Led Zeppelin's classics "Rock'n'Roll" and "Ramble On". Fan-filmed footage of the first one can be seen here:В 

Foo Fighters, Jimmy Page & John Paul Jones- "Rock'n'Roll" (live at Wembley)