Desc: Der ewige Klang: Directed by Günther Rittau. With Elfriede Datzig, Rudolf Prack, Olga Tschechowa, Wilhelm Borchert. The Buchner brothers are violin makers, Matthias is the better craftsman, Berthold a talented musician. When Matthias buys a famous violin to study its secrets Berthold steals it and pursues a career in the international concert halls.