Spiritual songs > Hymns to the Mother of God
Bohorodice D’ivo
This is actually a troparia to the Mother of God, which is sung at the end of Vespers before the blessing of bread for major feasts. But since the text is well-kmown (as the Byzantine version of the "Hail Mary"), it is often sung before or after services, or as a general Marian anthem. For an English version, see Rejoice, O Virgin Theotokos.
Sources
The text of the troparion can be found in the Horologion (Časoslov).
A musical setting was provided in the Marian Hymnal (1984) on page 18.