Carillon is a pitched percussion instrument that is played with a keyboard, usually found in churches. It consists of several bells made of cast bronze fixed in suspension. These bells are tuned in chromatic order and can be sounded together harmoniously. All these bells are housed in bell towers.
Here is the second biggest Carillons in the world, consisting of 100 tons of 72 bells housed inside a tower. Some of these bells are of the size of a car. There is a massive keyboard with which the Carillon is played. In this video Rob Scallon introduces Joey Brink who explains about this massive Carillon in the University of Chicago at 1928 Rockefeller Chapel.
Let us not waste time and go straight into the video.