"Jimmy Kimmel Live" went all out last night when it took over the usually gridlocked, tourist-ridden section of Hollywood Boulevard at Highland to put on a concert worthy of rock history. If you weren't one of the 10,000 or so in the audience flooding the blocked off street, you may be wondering exactly who has the clout to shut down one of Los Angeles' most trafficked intersections to stage a free show. That would be the one and only Dave Grohl, who brought an all-star troupe of rock musicians like John Fogerty, fellow Foo Fighter Taylor Hawkins, and Nirvana bandmate Krist Novoselic on stage for the Hollywood Boulevard blowout.