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In 1781 Grundmann added a third key to the oboe, and from that point on German instrument makers began adding more and more keys. The aim was to provide a tone hole which could be closed by a key for every half tone so that cross-fingerings would no longer be necessary. This trend was followed in France, albeit with some misgivings, since many musicians felt that the quality of the sound suffered from a surfeit of keys.
In around 1825 oboes with fifteen tone holes and ten keys were being made in both Germany and France. Despite this the instruments had a fundamental difference, since the differing sound esthetics governing oboe-making had led to the emergence of two distinct types which later became known as the “French” oboe and the “German” oboe.
In France the trend was toward narrower tubing, thinner walls and thinner reeds, whereas in Germany a wider bore was retained along with the characteristics of the classic oboe – thick-walled tubing, a contraction rim round the inside of the bell, the barrel (baluster) and rings on the upper joint with the simple mechanism featuring long-levered keys mounted on wooden blocks. Stephan Koch (1772–1828) and Joseph Sellner (1787–1843) developed an innovative version in 1820 in Vienna which combined features of both models: a classic appearance with a bore that was extremely narrow by the standards of the time.
Both the French oboe and the Viennese “Sellner-Koch oboe” had a bright sound and were distinctly audible in the orchestra, whereas the German oboe retained the darker timbre of the classical era which was more conducive to tonal blending.
In France, inventive instrument makers provided the oboe with a constant stream of technical innovations, among them the speaker key (which made overblowing unnecessary), a mechanism that made a complex interaction of levers and keys possible (introduced by the Triébert family), Theobald Boehm’s ring key (operating a key by means of a ring on a rod; at the same time another tone hole is closed) and Auguste Buffet’s pin springs.
Theobald Boehm (1794–1881), a trained goldsmith and flutist, developed a revolutionary keywork for the transverse flute which was received with great enthusiasm in France. Some parts of this system were subsequently adapted for use on the other woodwind instruments, although a radically altered Boehm oboe failed to gain acceptance on account of its novel sound (as did a Boehm bassoon).
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