A bell is a simple idiophone percussion instrument. Although bells come in many forms, most are made of metal cast in the shape of a hollow cup, whose sides form a resonator which vibrates in a single tone upon being struck. The strike may be made by a "clapper" or "uvula" suspended within the bell, by a separate mallet or hammer, or—in small bells—by a small loose sphere enclosed within the body of the bell.

Some bells are used as musical instruments, such as carillons, (clock) chimes, agogô, or ensembles of bell-players, called bell choirs, using hand-held bells of varying tones. A "ring of bells" is a set of four to twelve or more bells used in change ringing, a particular method of ringing bells in patterns. A peal in changing ringing may have bells playing for several hours, playing 5,000 or more patterns without a break or repetition. They have also been used in many kinds of popular music, such as in AC/DC's "Hells Bells" and Metallica's "For Whom the Bell Tolls".

Source: Bell from Wikipedia

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