The Communion is the Gregorian chant sung during the distribution of the Eucharist in the Roman Rite Catholic Mass. It is one of the antiphonal chants of the Proper of the Mass, and the final chant in the proper. It is followed by the Post-Communion. Since it is part of the Proper of the Mass and changed according to the Mass, the most common musical settings of it are for special Masses such as Requiem Masses, where the chant has the incipit Lux aeterna. The text is ordinarily from a psalm.