On August 17th at Red Rocks Amphitheater in Colorado, Metallica's bassist Robert Trujillo sat in with his acoustic guitar rock friends in Rodrigo y Gabriela at a sold-out show. Trujillo took to the stage to perform a medley of Metallica songs including "Orion," "For Whom The Bell Tolls," "The Frayed Ends of Sanity" and "Battery." Footage from the event can be seen below. Rodrigo y Gabriela is currently out on tour in support of latest record, "9 Dead Alive."