Austria to keep Nazi-looted Klimt masterpiece A leading panel of experts on Friday recommended that Austria not return one of the country's most treasured artworks to the descendants of its Jewish former owners robbed by the Nazis. Gustav Klimts 'Beethoven Frieze' fresco, 34 metres long, two metres high and weighing several tons, is widely regarded as a central masterpiece of Viennese "Jugendstil" art nouveau from the early 20th century. IMAGES AND SOUNDBITES.