What is a musical instrument that is played with a keyboard and consists of fixed bells called?

A carillon is a pitched percussion instrument that is played with a keyboard and consists of at least 23 cast bronze bells in fixed suspension and tuned in chromatic order so that they can be sounded harmoniously together. Housed in bell towers, carillons are usually owned by churches, universities, or municipalities. The bells are struck with clappers connected to a keyboard of wooden batons played with the hands and pedals played with the feet. Often, carillons include an automatic system through which the time is announced and simple tunes are played throughout the day.

The origins of the carillon can be traced back to the Low Countries—present day Belgium, the Netherlands, and the French Netherlands—in the 16th century. The modern carillon was invented in 1644 when Jacob van Eyck and the Hemony brothers cast the first tuned carillon. The instrument experienced a peak until the late-18th century, a decline during the French Revolution, a revival in the late 19th century, a second decline during the First and Second World Wars, and a second revival thereafter. UNESCO has designated 56 belfries in Belgium and France as a World Heritage Site and recognized the carillon cultures of Belgium and the Netherlands as intangible cultural heritages.

Carillons come in many designs, weights, sizes, and sounds. They are among the world's heaviest instruments. They weigh between 4.5 and 15 metric tons (5.0 and 16.5 short tons).