Answer:
A carillon is a musical instrument consisting of a minimum of 23 bells of varying sizes. In the case of the National Carillon in Canberra, there are 55 bells ranging in size from 7 kg to 6 tonnes, and covering a range of four and a half octaves. The carillon bells are operated by a clavier in the carillon tower.
The Nation Carillon in Canberra, Australia was presented to the Australian people by the British government, and formally accepted by Queen Elizabeth II on behalf of all Australians on 26 April 1970. It was presented as a gift to celevrate the 50th anniversary of Australia's national capital.