Austrian pianist Paul Wittgenstein (who later became an American citizen) lost an arm in World War I. He commissioned composers including Maurice Ravel to write pieces for the left hand alone. Bettmann/CORBIS hide caption

itoggle caption Bettmann/CORBIS

Estonian composer Arvo Pärt, creator of contemplative music, photographed in 1990 by influential patron Betty Freeman. Betty Freeman/ECM Records hide caption

itoggle caption Betty Freeman/ECM Records