The clarinet family comprises all single reed instruments, including the saxophone. The predecessor of the fashionable clarinet was the simpler chalumeau, which J. C. Denner of Nuremberg enhanced c. 1700 into the clarinet. It was permitted into the orchestra during the 18th cent. , and Mozart used it significantly. Major advancements of the key system during the 19th cent. employed the concepts of Theobald Boehm. The clarinets in B flat and A are the general orchestral devices. The higher, shriller E flat clarinet also is a band tool and is used once in a while in the orchestra.