Before Sandor Fisher and his wife Valeria escaped the camps of World War II, the Jewish couple survived because of their ability to play violin. Sandor played the instrument until the end of his life, and on a stage in Richardson Tuesday night some 80 years after he escaped the labor camp, his violin rested under a musician’s chin. Its sounds captivated hundreds at the Eisemann Center during an evening of music at “Violins of Hope." During a nearly sold-out concert hosted by Chabad of Plano, a quartet of violinists used Holocaust-era instruments to put suffering, pain and history into...