According to the Sun Media, RUSH singer-bassist Geddy Lee and guitarist Alex Lifeson surprised the crowd by showing up about an hour into the FOO FIGHTERS' two-hour-and-10-minute performance to play with drummer Taylor Hawkins during his drum solo and the three musicans then played "YYZ", a spiralling progressive-rock instrumental from RUSH's 1981 album "Moving Pictures".The Toronto prog-rockers injected some much-needed energy and excitement into the proceedings and Hawkins even had a hug for Lee afterwards. "Rush! Rush!" screamed FOO FIGHTERS leader Dave Grohl in amazement as the two musicians walked off stage. "You've got nuts the size of grapefruits," said Grohl to Hawkins after he played with Lee and Lifeson. The members of the two bands know each other through Nick Raskulinecz, a U.S. record producer who has worked with both groups, most recently on RUSH's "Snakes & Arrows" album in 2007. Watch fan-filmed video footage of last night's jam below.