The drum is a member of the percussion group that can be large, technically classified as a membranophone. Drums consist of at least one membrane, called a drumhead or drum skin, that is stretched over a shell and struck, either directly with parts of a player's body, or with some sort of implement such as a drumstick, to produce sound. Drums are the world's oldest and most ubiquitous musical instruments, and the basic design has remained virtually unchanged for thousands of years.Most drums are considered "untuned instruments", however many modern musicians are beginning to tune drums to songs; Terry Bozzio has constructed a kit using Diatonic and Chromatically tuned drums, few such as timpani are always tuned to a certain pitch. Often, several drums are arranged together to create a drum set that can be played by a musician.
The shell almost invariably has a circular opening over which the drumhead is stretched, but the shape of the remainder of the shell varies widely