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Encyclopediacalliopecalliope, in music, an instrument also called steam organ or steam piano in which steam is forced through a series of whistles controlled by a keyboard. It is usually played mechanically, and its shrill music is a familiar accompaniment of circus parades. It is named for the Muse of Eloquence. The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.
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