Many different names are given to the ancient service commemorating Jesus dying on the cross. In the monastic tradition the medium of worship is Gregorian chant, and the services include these common elements: the sixth century hymn, Pange,lingua by Fortunatus; penitential psalms 22, 69; lamentations from Jeremiah; responsories retelling the events of the day; and the Christus factus est, “Christ became obedient unto death.”