English:Enechema (ἐνήχημα), sometimes
apechema (ἀπήχημα), is an intonation formula which is sung by the leader of choir at the beginning in order to indicate the mode (
ἦχος) and the intonation of
Orthodox chant to the singers of the choir. The abridged form is called "modal signature" and functions like a clef (modal key) within
neume notation and its
Octoechos system. Its use was imitated by Carolingian cantors in their
tonaries.
<nowiki>Глас (музыка); Echos; Echos; Գլաս; Глас (музика); Glasuri; term in Byzantine music theory; Осмогласие</nowiki>