Carillon, KAR uh lon, is a set of 23 or more stationary bells arranged to play music. The bells vary in size from a diameter of 31/2 inches (9 centimeters) and a weight of 7 pounds (3.2 kilograms) to a diameter of 101/4 feet (3.1 meters) and a weight of 20 short tons (18 metric tons). A carillon has a range of two to six octaves. Most carillons are located in bell towers in Europe and North America. American carillons have from 23 to 77 bells.