A membranophone is any musical instrument which produces sound primarily by way of a vibrating stretched membrane.
According to Sachs, The sound is produced by a membrane ["skin" or "head"] stretched over an opening.
[1]The Hornbostel-Sachs scheme of musical instrument classification divides membranophones in a numeric taxonomy based on how the sound is produced: Membranophones can also be divided into small divisions based on length and breadth of sound production:[3] SIL International maintains a classification system based largely on shape:[5] The traditional classification of Indian instruments include two categories of percussion.
[6] The predrum category consists of simple drum-like percussion instruments.
Common in Native American music and the music of Africa, water drums are characterized by a unique sound caused by filling the drum with some amount of water.