Responses sung by the sistersOffice of Tenebrae on Holy ThursdayThe Lessons are sung by the clericsOffice of Tenebrae of Good FridayThe cantors sing the first verse of the psalmThe candles on the altar are extinguished during the BenedictusAt the end of the Office the last candle, representing Our Lord Jesus Christ, is hidden behind the altar. This illustrates the disappearance of the "Light of the World" (Jn VIII, 12) at Our Lord’s death.At the end of each psalm a candle of the fifteen-branched candlestick is extinguished