Timpani, also known as kettledrums, are large, tunable percussion instruments commonly used in orchestras and concert bands. They consist of a rounded shell made of wood or metal, with a drumhead stretched over the top. Players can adjust the tension of the drumhead to change the pitch, allowing for a range of musical notes. Typically, a set of timpani includes multiple drums, each tuned to a specific pitch. They are played with mallets, and their deep, resonant sound adds richness to orchestral music. Ludwig van Beethoven and Richard Wagner are notable composers who have incorporated timpani into their works.