St. Cyril & Methodius Ukrainian Church Choir

Belgrade Singing Society

Greek Orthodox Polyphonic Chorus of Anthens

Sofia Ecclestiastical Choir

Russian Choir of the Holy Blood Church

St. Michael's Romanian Church Choir

Armenian Apostolic Chorus of Jerusalem

Georgian Orthodox Choir of Tiflis

Greek Orthodox triphonic Chorus of Athens

Greek Orthodox Tetraphonic Chorus

Monks Choir of Kyiv Pechersk Monastery