Maurice Ravel was 31 when he began writing a piece that he called simply, "La Valse.""The Waltz." He was 45 when he finished it. In those 14 years, everything changed: Ravel, Europe, and the piece itself. It began as a light tribute to carefree Viennese waltzes. Ravel set the piece aside, then saw the agony of World War I firsthand. When he came back to his waltz, the world was very different place. He was a very different man. And La Valse was no longer a light tribute. In 13 minutes, you'll hear the waltz slowly go delirious, spin out of control, and finally, fly apart into chaos.