86. While the priest is receiving the Sacrament, the Communion chant is begun. Its purpose is to express the communicants' union in spirit by means of the unity of their voices, to show joy of heart, and to highlight more clearly the "communitarian" nature of the procession to receive Communion. The singing is continued for as long as the Sacrament is being administered to the faithful. If, however, there is to be a hymn after Communion, the Communion chant should be ended in a timely manner.
Care should be taken that singers, too, can receive Communion with ease."
While the GIRM states that the Communion chant should be begun as the celebrant receives the Eucharist, it is referring (in the ideal, at least) to the "Communion chant" i.e. the proper Communion antiphon for the day.
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