"Miserere mei, Deus"

Miserere, full name "Miserere mei, Deus" (Latin: "Have mercy on me, O God") by Italian composer Gregorio Allegri, is a setting of Psalm 51 (50) composed during the reign of Pope Urban VIII, probably during the 1630s, for use in the Sistine Chapel during matins, as part of the exclusive Tenebrae service on Wednesday and Friday of Holy Week. The service would start usually around 3AM, and during the ritual, candles would be extinguished, one by one, until one remained alight and hidden. Allegri composed his setting of the Miserere for the final act within the first lesson of the Tenebrae service