Troparion (also tropar; plural troparia) is a type of hymn in Byzantine music, in the Orthodox Church and other Eastern Christian churches. It is a short hymn of one stanza, or one of a series of stanzas; this may carry the further connotation of a hymn interpolated between psalm verses. Troparia are also found as the stanzas of canons. Such troparia are modeled on the irmoi of the ode. Troparia are also sometimes used as refrains for chanted psalm verses, though stichera more often serve this function.