The cornet is a treble wind instrument made of brass, the modern cornet being of comparatively recent origin.Originally the cornet was curvilinear or serpentine in form and increasing in diameter from the mouthpiece to the lower end. The modern form of cornet, formerly called a cornet-a-pistons or cornopean, is a form of keyed bugle and is played with a cupped mouthpiece, and possesses a quality of tone which comes between those of the trumpet and the bugle, the size of its tube being intermediate to those used for these instruments. Three slides are employed which lengthen the tube to produce intermediate tones. Research Cornet