comparing sacrosanctum concilium and ...
Tra Le Sollecitudini, by Pope St Pius X.
Point 1. The Liturgy is for the glorification of God and the sanctification of the faithful, and Sacred Music plays an important role in this.
To accomplish so great a work, Christ is always present in His Church, especially in her liturgical celebrations. [snip] Christ indeed always associates the Church with Himself in this great work wherein God is perfectly glorified and men are sanctified.TLS, 1.
Sacred music, being a complementary part of the solemn liturgy, participates in the general scope of the liturgy, which is the glory of God and the sanctification and edification of the faithful.To be continued.