IRMOS - a word meaning "link" in Greek. The Irmos is the theme-song and the first hymn of each ode of a Canon. It has a double function: it "links" the ode thematically with the Biblical canticle which serves as its prototype, and, by establishing the meter and melody for all the other hymns (troparia) of the ode, it is the first "link" in their chain.
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