Keyed bugle

The keyed bugle (also Royal Kent bugle, or Kent bugle) is a high-pitched brass instrument with a wide conical bore and tone holes operated by keys to alter the pitch and provide a full chromatic scale. It was developed from the bugle around the year 1800 and was popular in military bands in Europe and the United States in the early 19th century, and in Britain as late as the 1850s, by which time it had been superseded by the flugelhorn and cornet after the invention of valves.