It?s the dreaded sound at any live performance ? a ringing cellphone.That?s what happened Tuesday night at Lincoln Center?s Avery Fisher Hall during the final movement of Gustav Mahler?s Ninth Symphony by the New York Philharmonic. Maestro Alan Gilbert stopped the orchestra until the phone was silenced.The Wall Street Journal (http://on.wsj.com/xvTkcr) reports that when an iPhone?s distinctive ?Marimba? ...