In the 19th century, French and German oboe designers produced very different instruments. The German oboe was shorter with a wider bore and a different keying system. It was praised for its tone across registers but fell out of fashion as the French oboe (known as the "Conservatoire" design). Only in Vienna did orchestras continue using the German design, which we now call a "Wiener Oboe" or "Viennese Oboe." Though Viennese oboes remain scarce outside of Austria, many period oboists use them when playing 18th and 19th-Century pieces. The Viennese oboe sounds more like Mozart-era oboes but has the advantage of a modern keying system that makes playing challenging passages easier.