And the world was not calm

To tweet or not to tweet? Amanda Ameer checks in with David Lang and Hilary Hahn; Greg Sandow is pro; Matthew Guerrieri is con; Lisa Hirsch takes a historical perspective. Although I enjoy reading mid-concert reports by Steve Smith and others, I might be in the old-fogey camp on this one. When Parissa sang last Friday night, the sight of a guy in front of me Twittering away punctured the mystical state into which I had been transported. (It had nothing to do with the Iranian election, which was