matins of Holy Friday
On Great Friday, we observe the Holy, saving and awesome Passion of our Lord, and God, and Savior Jesus Christ;
the spittings, the scourgings, the buffetings, the scorn, the mocking, the purple robe, the reed, the sponge, the vinegar, the nails, the spear and above all, the Cross and death, which He willingly suffered for us.
We also observe the confession unto salvation of the penitent thief, who was crucified with Him.
from the Synaxarrion of Great Friday
the 15th Antiphon is chanted in all Orthodox Churches on Thursday evening.
The music is the Boston Byzantine Choir.