As promised, here is the answer (borrowed from Wikipedia)—
A calliope is a musical instrument that produces sound by sending a gas, originally steam or more recently compressed air, through large whistles—originally locomotive whistles.
A calliope is typically very loud. Even some small calliopes are audible for miles. There is no way to vary tone or loudness. The only expression possible is the timing and duration of the notes.
The steam calliope is also known as a steam organ or steam piano. The air-driven calliope is sometimes called a calliaphone, the name given to it by its inventor, but the “Calliaphone” name is registered by the Miner Company for instruments produced under the Tangley name.
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