NASHVILLE, Tenn. (AP) — Violins that were once used to make music in concentration camps and ghettos during the Holocaust are now on display for free at the Nashville Public Library in Tennessee. A library news release says the Violins of Hope collection of 26 instruments was put on display starting Monday after three performances by the Nashville Symphony. Two Israeli luthiers, father and son Amnon and Avshalom Weinstein, spent decades finding and restoring the instruments.The violins have been used in concert by orchestras around the world.