Idiomelon (Greek: idio, "unique" + melon, "melody"; Church Slavonic: samoglasen)—pl. idiomela—is a sticheron which originally had it's own tune, and did not follow that of any other. An idiomelon is is assigned to one of the eight tones of Byzantine chant, is not patterned on any other hymn in terms of meter, content, or melody, and do not serve as models or patterns for other hymns of the same textual category. These include, for example, stichera of the Resurrection, stichera of Great Feasts, etc It melodically follows the schema of the tone and yet is usually eccentric in its metre.
- Fr. Laurence (Campbell), ed., The Unabbreviated Horologion or Book of the Hours, 2nd Ed. (Brick, NJ:Yes Press, 1995), p 328.