percussion instrument consisting of a circular flat or concave metal plate that is struck with a drumstick or is used in pairs struck glancingly together. They were used, often ritually, in Assyria, Israel (from c. 1100 BC), Egypt, and other ancient civilizations and reached East Asia in medieval times and Europe before the 13th century. Most Asian cymbals are either broad-rimmed, with or without a dome (boss), held horizontally, and clashed loudly, or small-rimmed (or rimless), held vertically, and played softly. Western orchestral cymbals derive from those used in the Turkish military bands in vogue in 18th-century Europe (see Janissary music), and cymbals were introduced in work by Joseph Haydn (Haydn, Joseph) (notably his Military Symphony, 1794), Mozart (Mozart, Wolfgang Amadeus), and Beethoven (Beethoven, Ludwig van). In Romantic music—e.g., Richard Wagner's (Wagner, Richard) Tannhäuser—they are frequently used to mark a dramatic climax. Traditionally the best cymbals came from Turkey—their manufacture and copper-tin alloy a guarded secret.

Of indefinite pitch, modern cymbals are about 36–46 cm (14–18 inches) in diameter, domed at the centre (where the holding strap is attached), and slightly tapered to secure contact at the edges only. They are capable of a wide dynamic range. Though usually clashed or brushed together, they may also be operated with a foot pedal (as in the hi-hat) and may be brushed or struck in the closed or open position, or a single cymbal may be struck with a brush or a hard- or soft-ended drumstick. From the late 20th century, some composers specified using a bow to sound a cymbal. Additional techniques are used in jazz and dance bands.