Castanets are a percussion instrument (idiophone), used in Moorish, Ottoman, ancient Roman, Italian, Spanish, Sephardic Music, and Portuguese music. The instrument consists of a pair of concave shells joined on one edge by a string. They are held in the hand and used to produce clicks for rhythmic accents or a ripping or rattling sound consisting of a rapid series of clicks. They are traditionally made of hardwood, although fibreglass is becoming increasingly popular.
In practice a player usually uses two pairs of castanets. One pair is held in each hand, with the string hooked over the thumb and the castanets resting on the palm with the fingers bent over to support the other side. Each pair will make a sound of a slightly different pitch.
The origins of the instrument are not known. The practice of clicking hand-held sticks together to accompany dancing is ancient, and was practised by both the Greeks and the Egyptians. In more modern times, the bones and spoons used in Minstrel show and jug band music can also be considered forms of the castanet.