The celebrated "sound sculptor" Trimpin has long been haunted by the story of the Gurs prison camp in southern France, where thousands of Jews were held during World War II. Now he's commemorating this little-known chapter of the Holocaust with a major new multimedia performance. We discussed the Gurs Cycle with Trimpin, director Rinde Eckert, Gurs survivor Manfred Wildman, and Victor Rosenberg, whose family letters are used in the performance.