The drum is a member of the percussion group of musical instruments,
which is technically classified as the membranous Drums consist of
at least one membrane, called a drum head or drum skin, that is stretched
over a shell and struck, either directly with the player's hands, or
with a drum stick, to produce sound. There is usually a "resonance head"
on the underside of the drum, these are usually tuned to a slightly
lower pitch than the top drum head. Other techniques have been used to
cause drums to make sound, such as the thumb roll. Drums are the world's
oldest and most ubiquitous musical instruments, and the basic design
has remained virtually unchanged for thousands of years.
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