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Kettledrum
A kettledrum (or kettle drum) is a type of percussion instrument in which a membrane is stretched over a large hemispherical bowl. Traditionally, the bowl is made of a metal such as copper or bronze, but materials such as clay and wood have also been used.

In Western music, timpani are the most commonly used types of kettledrums, so much so that their names have almost become synonymous. However, most cultures, especially those of Southeast Asia and the Middle East, have their own distinct types of kettledrums.

Etymology and terminology
The word "kettledrum" first appeared in the writings of Thomas Seymour to Henry VIII in 1542 after the king had ordered several sets from Vienna.

In the Hornbostel–Sachs system, kettle drums were given the number '211.1' as part of their own unique classification.

History
Some of the earliest kettledrums appeared in Southeast Asia during the 6th century BCE and now serve as late Bronze age artifacts. Such drums, such as the Đông Sơn drums of Vietnam, were made using the lost-wax casting technique.

As war drums
Kettledrums have had a long history as serving as war drums, particularly within the cavalry.