Question: During which service is the canticle upon which Bach's cantata Meine Seel erhebt den Herren, BWV 10 is based traditionally included in the Eastern Orthodox church?
Sentence (from "Magnificat"): The Magnificat (Latin: [My soul] magnifies [the Lord] ) is a canticle, also known as the Song of Mary, the Canticle of Mary, and, in the Byzantine tradition, the Ode of the Theotokos (Greek: Ἡ ᾨδὴ τῆς Θεοτόκου ).
Relevant evidence: Yes