
Timpani
Tuned percussion instrument

Tuned percussion instrument
The sound of the timpani is powerful, rolling, thunderous, capable of conveying tension, anxiety, or a triumphal thunderclap. They can sound as dry strikes or thick sustained rolls (tremolo).
They consist of a hemispherical copper or fiberglass kettle with a leather or plastic membrane stretched across it. Using a foot pedal, the musician alters membrane tension, precisely tuning the timpani to a target pitch in the orchestral score.