The Office of Darkness—Officium Tenebrarum or Officium Tenebrarum in Latin—comprises the offices of matins and lauds traditionally sung or recited in the evening for the last three days of Holy Week, what we call the Sacred Triduum. In the Philippines, this office is called in its Spanish name, tinieblas, which has also lent its name, at least in some localities, to the large wooden clapper installed in the belfries of those times, more widely known as matracas, apparently because when the time of the customary noise was come, the belfry clapper was also sounded. The tinieblas are sung at the new chapel of the Parish of the Most Holy Redeemer in the Diocese of Cubao by members of the Cappella Gregoriana Sanctae Caeciliae olim Xicatunensis at 6:00 in the evening
As last year, the tenebrario, what we call in Latin as the candelabrum triangulum and in English as the tenebrae hearse, holding fifteen sockets for support fifteen candles, and the Lectionarium tenebrale pro Tridui Sacri matutinis proper to the schola singing the tinieblas, containing the notations of all the lessons sung during the office, were used. At the end of the offices, only the topmost candle remains lit.
Ut in omnibus laudetur Dominus.