The cornet is a lip vibrating air singing instrument, which has the same sound domain as the trumpet. However, because the conical tube accounts for a high proportion and has many bends, it has a smooth and soft sound and smooth sound transfer. A French musical instrument manufacturer added a piston mechanism to the post car number in Germany in the 1820s, which evolved into today's cornet.

The shape of cornet is similar to trumpet or military step, but its voice is loud and mellow, and its function is much larger. After 1828, the orchestra in Paris first used the cornet. The cornet has a piston and a sound changing tube, and its range is quite wide, from low d to C. The basic pitch of the modern cornet is usually set as a flat B. In 1834, the manufacturer added a "bell hammer key" to the cornet to make a trill.

Source: @toschie