timpani <p>Kettledrums of the Western orchestra, consisting of a large bowl-shaped resonating shell, usually of copper, with a drumhead of calfskin or plastic, and some device for tightening or slackening the drumhead so as to tune it to a given note.</p>
<p>Source: Art & Architecture Thesaurus</p>
<p>http://vocab.getty.edu/page/aat/300197554</p>