The Kronos Quartet began its Fall 2010 touring season in its hometown San Francisco, by premiering a young Iranian composer’s "Threnody for Those Who Remain," along with a selection of new and recent compositions written in reaction to social and political turmoil.  Also on the program, an iconic piece about the Vietnam War era which the ensemble's founder says inspired the formation of the group.  VOA's Behnam Nateghi has more.