The cornet and the trumpet have the same vocal range, but because the conical tube accounts for a high proportion and the tube is bent a lot, it has a smooth and soft sound, and the transition is also very smooth. The cornet is often used in military bands, various light music bands, especially in jazz bands, where it often plays an important role in the lead. Orchestras and various mixed bands are also often used, and the situation is roughly: the soft and gorgeous tone of the cornet and its popular earthly mood are deliberately pursued; the band requires three or four trumpets to play, and the number of trumpets is insufficient or There is no trumpet in the band, only a cornet, in which case a cornet can be used in place of the trumpet (this may be the case in a non-professional orchestra). The cornet is a variant of the trumpet, usually only used in marching and ballroom bands, and rarely in orchestras. There is also E-flat cornet, which is used less frequently.

Instrument Name: Cornet
Instrument native key: B flat.
Application clef: treble clef, transpose the major second notation.
Practical range: small character group F - small character second group C.
Structural composition: mouthpiece, pipe body and mechanical three parts. The pipe is 1.335 meters long, and the mechanical part is composed of a piston and a piston sleeve. By pressing the piston, the bypass pipe is connected to achieve the purpose of extending the number pipe.
Material used: phosphor copper tube.
Instrument Features: Soft tone.

Cornet lengths vary from 35.5 cm (14 inches) to 66 cm (26 inches). The cornet player blows air slowly into the mouthpiece, and the air follows the bend of the copper pipe and returns through the phonograph. The copper pipe continues forward, returns through another voice-changing pipe, and enters the third piston. From the first piston there is access to the bell-shaped bell, giving the cornet a beautiful and smooth sound. The pitch of the cornet is controlled by the piston. The first piston lowers a whole step, the second lowers a semitone, and the third lowers a minor third.