Today is Holy Thursday, Maundy Thursday, which re-presents pro nobis the evening in which Our Lord instituted the Most Holy Eucharist.
At Saint-Eugène, the bells have sounded at the Gloria, their last time until the Easter Vigil. The Schola is singing the Mass Exsultate Deo (1699) of François Cosset (c 1610-1673), maître de chapelle at Laon, Reims et Paris with Credo I. The libellum for the Mass is here.
At the Communion, Guillaume Bouzignac's motet Ecce festivitas amoris.
And the antiphon Coenae tuae, from the Byzantine and Ambrosian Rites, adapted by M. de Villiers from the polyphony of Alexei Lvov (1798-1870, maître de la chapelle at the Imperial Court in Saint Petersburg). (He's written an article about this which alas I'm not reading this morning; later on, perhaps, but certainly in the Octave.)