Castanets are a percussion instrument (idiophone), used in Kalo, Moorish, Ottoman, ancient Roman, Italian, Spanish, Sephardic, Swiss, 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 (chestnut; Spanish: castaño). In the first video, you can see the castanets in action along side what sound like Middle Eastern style drums. In the second video, you will see a beautiful flamenco performance featuring a castanet player and dancer, and a violin quartet. Contrary to popular belief, castanets are not commonly used in the flamenco dance, except for two specific forms: zambra and siguiriyas. In any case, this instrument can be heard in lots of Latin and Arabic fusion music!