Percussion instruments produce a sound by hitting, shaking, rubbing, or scraping an object. It is believed that percussion instruments were the first musical devices ever created. Some of the percussion instruments are: drums, bongos, bells, cymbals, triangles and xylophones. In jazz, rock and many other styles of music percussion instruments are used extensively, with the bassist and the drummer forming the rhythm section. They are also indispensible in military marching bands. Percussion instruments are used more sparingly in classical music, usually to provide additional accents, though they are becoming more frequent in the twentieth century classical music.