1) Liturgy of the Hours 
The Ypakoë (also, Hypakoë, Ύπακοή, from the verb `υπακούω, `hearken` or `give ear`, to `respond`; Slavonic: Ўпакои) is a troparion chanted at Orthros (Matins) and the Midnight Office on Great Feasts and Sundays throughout the liturgical year in the Eastern Orthodox Church. The Ypakoë which is chanted on Sundays is found...