Rocker John Mellencamp said on Tuesday that the Internet was the most dangerous invention since the atomic bomb, although new technology could paradoxically delay the inevitable demise of rock 'n' roll. But before then, "some smart people, the China-Russians or something" may have already conquered America by hacking into the power grid and financial system, he warned during a public seminar at the Grammy Museum. Mellencamp, 58, has established a reputation during his career as a bit of a loose cannon disdainful of music industry niceties. He still lives in his home state of Indiana, saying he never fit in...