Calliopes are a type of musical instrument that produces a distinctive and loud sound using steam or compressed air. There are a number of synonyms for calliopes that can help you describe these instruments in different ways. Some of the most common synonyms for calliopes include steam organs, steam pianos, steam whistles, and circus organs. Other terms you might use to describe calliopes include fairground organs, street organs, and barrel organs. No matter what term you use to describe them, calliopes are loud, attention-grabbing instruments that have a unique place in the history of music and entertainment.