This image obtained from AP video shows a tag with the text ''K.L. Dachau'' seen through the f-holes of a Dachau-built instrument dubbed the ''violin of hope'' in Magyarpolány, Hungary, Tuesday April 22, 2025. (AP Photo/Nikolett Csanyi) BUDAPEST, Hungary — During World War Two, within the walls of the Nazi concentration camp at Dachau, a Jewish prisoner secretly penned a short note and hid it inside a violin he had crafted under harrowing circumstances — a message to the future that would remain undiscovered for more than 80 years. “Trial instrument, made under difficult conditions with no tools and materials,”...