Question: How much of the glaciation disappeared in the country the Rhine forms a border with along with Aschenbrödel's composer country of citizenship?

Near Tamins-Reichenau the Anterior Rhine and the Posterior Rhine join and form the Rhine. The Alpine Rhine begins in the most western part of the Swiss canton of Graubünden, and later forms the border between Switzerland to the West and Liechtenstein and later Austria to the East. The river makes a distinctive turn to the north near Chur. This section is nearly 86 km long, and descends from a height of 599 m to 396 m. It flows through a wide glacial alpine valley known as the Rhine Valley (German: Rheintal). Near Sargans a natural dam, only a few metres high, prevents it from flowing into the open Seeztal valley and then through Lake Walen and Lake Zurich into the river Aare. <SEP> since the peace of westphalia, the upper rhine formed a contentious border between france and germany. establishing "natural borders" on the rhine was a long-term goal of french foreign policy, since the middle ages, though the language border was – and is – far more to the west. french leaders, such as louis xiv and napoleon bonaparte, tried with varying degrees of success to annex lands west of the rhine. the confederation of the rhine was established by napoleon, as a french client state, in 1806 and lasted until 1814, during which time it served as a significant source of resources and military manpower for the first french empire. in 1840, the rhine crisis, prompted by french prime minister adolphe thiers's desire to reinstate the rhine as a natural border, led to a diplomatic crisis and a wave of nationalism in germany. <SEP> folk songs is a song cycle by the italian composer luciano berio composed in 1964. it consists of arrangements of folk music from various countries and other songs, forming "a tribute to the extraordinary artistry" of the american singer cathy berberian, a specialist in berio's music. it is scored for voice, flute (doubling on piccolo), clarinet, harp, viola, cello, and percussion (two players). the composer arranged it for a large orchestra in 1973. <SEP> High levels of precipitation cause the glaciers to descend to permafrost levels in some areas whereas in other, more arid regions, glaciers remain above about the 3,500 m (11,483 ft) level. The 1,817 square kilometres (702 sq mi) of the Alps covered by glaciers in 1876 had shrunk to 1,342 km2 (518 sq mi) by 1973, resulting in decreased river run-off levels. Forty percent of the glaciation in Austria has disappeared since 1850, and 30% of that in Switzerland. <SEP> He had written all the principal parts of the ballet, and was intending to fill in the orchestration as time permitted. Aschenbrödel ("Cinderella") is a ballet written by Johann Strauss II. However, Strauss died in 1899, and it was finished by composer Josef Bayer in 1900. <SEP> The Vienna Walzer Orchestra (German: Wiener Walzer Orchester) is a chamber orchestra based in Vienna, Austria that specializes in traditional Viennese waltzes, polkas, marches and operetta arias from composers such as: J. Strauss II, F. Lehár, C.M. Ziehrer, among others. Their concerts also always include performances by ballet dancers and opera singers.