The drum is a member of the percussion group of musical instruments. In the Hornbostel-Sachs classification system, it is a membranophone. All types of drums, such as timpani for example, are tuned to a certain pitch. Often, several drums, other than timpani drums, can be arranged together to create a drum kit. There is usually a resonance head on the underside of the drum, typically tuned to a slightly lower pitch than the top drumhead. Several factors determine the sound a drum produces, including the type, shape and construction of the drum shell, the type of drum heads it has, and the tension of these drumheads. Different drum sounds have different uses in music. The second biggest factor that affects drum sound is head tension against the shell. When the hoop is placed around the drum head and shell and tightened down with tension rods, the tension of the head can be adjusted.
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