A CALLIOPE is an eight-letter musical instrument that produces a loud, shrill sound. It is often used in fairs and carnivals to create a festive atmosphere. The CALLIOPE is a type of steam organ, which uses steam or compressed air to produce its sound. It is made up of a series of whistles, which are connected to a keyboard. The player can then press the keys to produce different notes. The CALLIOPE is a fair instrument because of its loud, cheerful sound, which can be heard from a great distance.