The von Trapps, Savannah King and more on local stages By Denny Dyroff, Staff Writer, The Times The Delaware Symphony Orchestra, with featured keyboardist Gabriela Martinez (pictured) opens the the 2014-15 season with “Heroes and Heroines” Sept. 19. The Delaware Symphony Orchestra, which has been one of America’s top regional orchestras for years, is kicking off its 2014-2015 season...