A drummer is a percussionist who creates and accompanies music using drums.
Most contemporary western ensembles bands for rock, pop, jazz, R&B etc. include a drummer for purposes including timekeeping and embellishing the musical timbre. The drummer's equipment includes a drum kit (or "drum set" or "trap set") which includes various drums, as well as cymbals and an assortment of accessory hardware such as pedals, standing support mechanisms, and drum sticks.
In other genres, particularly in the traditional music of many countries, drummers use individual drums of various sizes and designs rather than drum kits. Some use only their hands to strike the drums.
In larger ensembles the drummer may be part of a rhythm section with other percussionists playing, for example, vibraphone, marimba or xylophone. These musicians provide the timing and rhythmic foundation which allows the players of melodic instruments, including voices, to create collaborative musical performance.
As well as the primary rhythmic function, in some musical styles, such as world, jazz, classical, and electronica, the drummer is called upon to provide solo and lead performances, at times when the main feature of the music is the rhythmic development.
There are many tools that a drummer can use for either timekeeping or soloing. These include cymbals (china, crash, ride, splash, hi-hats, etc.), snare, toms, auxiliary percussion (bells, Latin drums, cowbells, temple blocks) and many others. Also there are single, double, and triple bass pedals for the bass drum.
Before motorized transport became widespread, drummers played a key role in military conflicts. Military drummers provided that set a steady marching pace and elevated troop morale on the battlefield. In some armies drums also assisted in combat by keeping cadence for firing and loading drills with muzzle loading guns. Military drummers were also employed on the parade field, when troops passed in review, and in various ceremonies including ominous drum rolls accompanying disciplinary punishments. Children also served as drummer boys well into the nineteenth century, though less commonly than is popularly assumed; due to the nature of the job, experienced older men were preferred.