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The '''irmos''' is the initial verse of each individual ode in a [[canon]], sung by the choir; from the Greek verb "to tie" or "to link.". The irmos presents a pattern for all of the [[troparion|troparia]] which follow within a given ode. It also gives its name to the '''irmologic''' forms of [[Byzantine chant]].  "The Irmos irmos ''links'' (thus the Greek name) the theme of the canon with the theme of the [[Biblical Odes|Biblical Ode]] which corresponds to the ode of the canon -- &mdash;because originally, the troparia of a [[Canon (hymn)|canon]] were interspersed between the final verses of the Biblical Odes."<ref>F.L. Cross & E.A. Livingstone, eds., ''The Oxford Dictionary of the Christian Church'', 2nd Ed. (Oxford: Oxford University Press, 1989), s.v. "Heirmos,", p 630.</ref>

==See Alsoalso==*[[Katavasia]]*[[Canon]]