The bells in a carillon are usually made to ring using a keyboard. It is similar to the one in a piano or organ, but is made up of wooden batons that are hit with closed fists instead of pressing them with fingers (see the picture on the left). Each baton is linked to a bell with a different pitch and makes it ring out. The bell with the lowest pitch is called the "bourdon", and many carillons have pedal keyboards for the largest bells. The instrument is very heavy, and the world's heaviest carillon, which is in a New York City church, weights 91 tonnes.