Holy Thursday (not part of the Triduum)
Holy Thursday would not technically be a Tenebrae service
THE SACRED TRIDUUM
Sundown on Holy Thursday to sundown on Easter Sunday is considered the most solemn part of the liturgical year. This three-day period is referred to as the Easter Triduum, also known as the Sacred Triduum, or Paschal Triduum.
• Up to 1955 the three consecutive Tenebrae services for Holy Thursday, Good Friday and Holy Saturday, including the typical ceremonies such as the extinguishing of candles, and each of these three services anticipated on the previous day, were widely celebrated as an integral part of the liturgy of Holy Week in churches with a sufficient number of clergy wherever the Roman rite was followed. A rich tradition of music composed for these central occasions had developed.
• From 1956 to 1970 the practice largely declined:• Finally, in the wake of the Second Vatican Council, Matins and Lauds throughout the year were completely reformed. Matins, for instance, no longer had the nine psalms and Lauds the five psalms that determined the number of candles extinguished in the Tenebrae celebration.• The 1955 papal document restored the celebration of Matins and Lauds of Holy Thursday, Good Friday and Holy Saturday to their original timing as morning services, with only a little allowance for anticipating any of them on the evening before. On these three days attention shifted from what became morning services to the services that were now to be held in the afternoon or evening. Communal celebration of Matins and Lauds became limited generally to communities that observed the full Divine Office in congregational form. Matins and Lauds, having lost their exceptional character, provided composers with little incentive to produce new music for them and there was no demand for grand performances of the existing music earlier composed for Tenebrae.
• The Roman Breviary, as updated in 1961, did not mention any specific Tenebrae ceremonies to accompany the no longer anticipated Matins and Lauds of Maundy Thursday, Good Friday and Holy Saturday.
"Fire and Light in the Western Triduum" by A.J. MacGregor
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