
Open to me the doors of repentance
Suprasl' Monastery Chant
Thou Who Art Filled With Light
Festal Choir of the Most Gracious Savior Monastery: Yekaterinburg

Oikos 1 and Kontakion 13 of the Akathist
Bulgarian Byzantine Chant
Traditions of Byzantine Singing: Serbian, Bulgarian, Greek
Choir of Priests of Sophia

Oh, Taste and See
Znamenny Chant
Christmas and Easter Chants of the 16th-17th centuries
Russian Patriarchate Choir

O Victorious Leader, Tone 8 (melismatic)
Bulgarian Byzantine Chant
Traditions of Byzantine Singing: Serbian, Bulgarian, Greek
Choir of Priests of Sophia

O Victorious Leader
Serbian Chant
Traditions of Byzantine Singing: Serbian, Bulgarian, Greek
Brotherhood Choir of Holy Archangels Michael and Gabriel Monastery

O Thy divine and beloved..
Byzantine Chant
Choir of the Brethren of the Monastery of Vatopedi on Mt. Athos

O Lord, Save Thy People
Byzantine Chant
Supplication Canon (Paraklesis) to Panaghia Paramythia
Choir of the Brethren of the Monastery of Vatopedi on Mt. Athos

O Lord of Hosts, Tone 8
Bulgarian Byzantine Chant
Traditions of Byzantine Singing: Serbian, Bulgarian, Greek
Choir of Priests of Sophia

O Give Thanks to the Lord (Athonite), Tones 1, 7, and 8
Byzantine Chant
Traditions of Byzantine Singing: Serbian, Bulgarian, Greek
Monastery Annunciation of Mother of God Women's Choir

Now the Powers of Heaven
Kyr Stephan of Serbia
Traditions of Byzantine Singing: Serbian, Bulgarian, Greek
Dragoslav Pavle Aksentyevich