Dave Grohl is the hardest working man in Rock and Roll...and here is he is again.Looks like Daveshowed up to perform a cover of Queen and David Bowie's "Under Pressure" with Chevy Metal, the cover act that is a side project of Foo Fighters drummer Taylor Hawkins. The show was part of a celebration marking the 60th anniversary of the California city of Costa Mesa. Chevy Metal also played covers of Van Halen's "Panama," the Rolling Stones' "Miss You," the Knack's "My Sharona" and the Vapors' "Turning Japanese" at the Costa Mesa Fairgrounds during their weekend set, with Grohl calling the group his favorite band