Castanets are small percussion instruments that make a sharp clicking sound when you snap them together in your hand. They look like two rounded shells connected by a string, and Spanish flamenco dancers traditionally hold a pair in each hand, clicking them rapidly to create complex rhythms that match their footwork.

Traditionally made from hardwood, castanets require real skill to play well. A flamenco performer might click out dozens of rapid patterns per minute, keeping perfect time with guitars and singing while also dancing.

You might see castanets in music class as a simpler instrument for keeping rhythm, often attached to a handle so younger students can shake them easily. These classroom versions don't require the finger technique of traditional castanets, but they create a similar sharp, wooden clicking sound that cuts through other instruments.

The clicking of castanets adds excitement and energy to music, like adding exclamation points to a sentence. When you hear that distinctive click-click-click, you might think of Spanish music and dance, even though similar instruments appear in other Mediterranean cultures too.