For some, however, the experience of the Communion Procession is far more prosaic, analogous perhaps to standing in line in the supermarket or at the motor vehicle bureau. A perception such as this is a dreadfully inaccurate and impoverished understanding of what is a significant religious action. The Communion Procession is an action of the Body of Christ. At Christ’s invitation, extended by the priest acting in Christ’s person: “Blessed are those called to the supper of the Lamb,” the members of the community move forward to share in the sacred meal, to receive the Body and Blood of Christ which is the sign and the source of their unity. In fact, each time we move forward together to receive the Body and Blood of the Lord, we join the countless ranks of all the baptized who have gone before us, our loved ones, the canonized and uncanonized saints down through the ages, who at their time in history formed a part of this mighty stream of believers.
This action by Christ’s body, the Church assembled for the Eucharist, is manifested and supported by the Communion Chant, a hymn in praise of Christ sung by the united voices of those who believe in him and share his life. The General Instruction of the Roman Missal takes this hymn very seriously, mandating that it should begin at the Communion of the priest and extend until the last person has received Communion.
For some, however, the singing of this hymn is perceived as an intrusion on their own prayer, their private thanksgiving after Communion. In fact, however, this hymn is prayer, the corporate thanksgiving prayer of the members of Christ’s Body, united with one another. Over and over again the prayers of the liturgy and the norms of the General Instruction emphasize this fundamental concept of the unity of the baptized, stressing that when we come together to participate in the Eucharistic celebration we come, not as individuals, but as united members of Christ’s Body. In each of the Eucharistic Prayers, though the petition is worded in slightly different ways, God is asked to send his Holy Spirit to make us one body, one spirit in Christ; the General Instruction admonishes the faithful that “they are to form one body, whether in hearing the Word of God, or in taking part in the prayers and in the singing…” (no. 96). It describes one of the purposes of the opening song of the Mass as to “foster the unity of those who have been gathered” (no. 47), and says of the Communion Chant that “its purpose [is] to express the spiritual union of the communicants by means of the unity of their voices, to show gladness of heart, and to bring out more clearly the ‘communitarian’ character of the procession to receive the Eucharist” (no. 86).
USCCB The Reception of Holy Communion at Mass