It took a bit of research, but I found the title on Youtube. This is what +Seraphim did, once in each direction (assistants sometimes held his arm aloft) - East, South, North, West. I had almost forgotten today is the Julian date of the feast, thus, the Eve of the feast co-incided with the arrival of the Pochaiv icon. Thus the musical piece was performed four times.http://www.youtube.com/watch?v=2scpPh7yJGM
The compose in Cyrillic is Григорий Федорович Львовский.
I grabbed this description elsewhere:
This chant, “Hospodi Pomilui”, written by Russian composer Lvovsky in the 19th c., is sung in Russian Orthodox churches in worship on the Eve of Holy Rood or Holy Cross. It means “Lord, have mercy” and the words are sung seventy-five times, reminiscent of the scripture when Jesus tells his disciples that they must forgive not seven times but seventy-seven times or seven times seventy. In the service the bishop stands in the center of the church, holding the cross above his head. As he lowers the cross, the choir sings in decreasing volume, to the point of pianissimo—as the cross touches the floor. Then the cross is raised again and the choir rises in a crescendo of triumph.
As the cross lowers, so the faithful prostrate to the ground, then they get up again.