Pitched percussion instruments, usually arranged in a set of four, played by one musician. Also known as kettledrums, common in symphony orchestras.
Also known as kettle drums, timpani are large, tunable drums. Pieces sometimes call for multiple tuning changes in one piece, which can be achieved using a tuning mechanism like a foot pedal. A typical equipment setup consists of 4 timpani of different size, with a 2-3 inch difference in head size between each consecutive pair.