The King of Newgrass Music, aka Sam Bush delivering a powerhouse set, varied, unpredictable, extraordinary -- basically, the stuff musical geniuses do, with his great band of banjoist Scott Vestal, guitarist Stephen Mougin, drummer Chris Brown, and bassist Todd Parks, at the "Stills in the Hills -- An Appalachian Jamboree" festival in Seven Springs, Pennsylvania, June 15, 2013.