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The Foo Fighters' Dave Grohl brought up an audience member to the stage, a drummer to play their tune "Big Me" which.... wow, that must have made his not only his night, but his life to know that he jammed with the Foo Fighters in an arena with thousands of people watching him.
The second time he did this, Grohl brought up a singer to take over the mic for Rush's "Tom Sawyer" - which is not an easy song to sing! Hell, there is no such thing as an easy Rush tune.