This is a must read: Singing the Mass, by Bishop Thomas J. Olmsted of Phoenix:
St. Augustine recounts in his autobiography Confessions an experience he had during the singing of the Mass:
“How I wept, deeply moved by your hymns, songs, and the voices that echoed through your Church! What emotion I experienced in them! Those sounds flowed into my ears, distilling the truth in my heart. A feeling of devotion surged within me, and tears streamed down my face — tears that did me good.”
How can we explain this overwhelming and transforming experience that led one of our greatest saints to the Church? Clearly, this was much more than a man simply being moved by a well-performed song. His entire being was penetrated and transformed through music. How can this be?
At Mass, Christ sings to the Father
The Catechism of the Catholic Church (#1157) makes a direct reference to St. Augustine’s experience when it teaches that the music and song of the liturgy “participate in the purpose of the liturgical words and actions: the glory of God and the sanctification of the faithful.”
The Mass itself is a song; it is meant to be sung. Recall that the Gospels only tell us of one time when Jesus sings: when he institutes the Holy Eucharist (Cf. Mt 26:30; Mk 14:26). We should not be surprised, then, that Christ sings when he institutes the sacramentum caritatis (the Sacrament of love), and that for the vast majority of the past 2,000 years, the various parts of the Mass have been sung by priests and lay faithful. In the 1960s, the Second Vatican Council strongly encouraged a rediscovery of the ancient concept of singing the Mass: “[The musical tradition of the universal Church] forms a necessary or integral part of solemn liturgy” (Sacrosanctum Concilium,112). The Mass is most itself when it is sung.
This recent rediscovery of “singing the Mass” did not begin with the Second Vatican Council. READ FULL ARTICLE