A calliope is a musical instrument. It is played with a keyboard, and sends steam though whistles to make sound. Joseph Stoddard of Worcester, Massachusetts invented the calliope in 1855. The calliope is sometimes called the "steam organ" or "steam piano." It was often played on riverboats and in circuses.

Even the smaller calliopes give off a sound that can be heard for miles around. This has often led to complaints by the neighbors.

But the chances of hearing a calliope are slim because most of them disappeared with the fading away of the age of steam. As the internal combustion engine replaced steam boilers as a source of power it became difficult to find a steady, cheap supply of medium-pressure steam to power a calliope. Eventually the skills needed to tend or repair a steam boiler giving the required pressure also became less widespread. Only a few working caliopes have survived, and they are not used often.