Bass drum

The bass drum is a large drum that produces a note of low definite or indefinite pitch. The instrument is typically cylindrical, with the drum's diameter usually greater than its depth, with a struck head at both ends of the cylinder. The heads may be made of calfskin or plastic, and there is usually a way to adjust the tension, either by threaded taps or by strings. Bass drums are built in a variety of sizes, but size does not dictate the volume produced by the drum.