Our small schola has mastered Henri Dumont's Messe Royale, which we have sung at all our monthly Latin Masses since it started; now, owing to a request from the congregation, we are learning the Missa de Angelis (Mass VIII and Credo III). I am aware that this setting of the Ordinary is sometimes done to death, and isn't considered the best nor the purest Gregorian chant, but it remains popular; and it is an introduction to the many other beautiful Gregorian chant Masses.
We also returned to an old favourite tonight: the Passiontide Vesper hymn, Vexilla Regis prodeunt.