"[Address] one another in psalms and hymns and spiritual songs, singing and making melody to the Lord with all your heart." Like the inspired writers of the New Testament, the first Christian communities read the Book of Psalms in a new way, singing in it the mystery of Christ. In the newness of the Spirit, they also composed hymns and canticles in the light of the unheard - of event that God accomplished in his Son: his Incarnation, his death which conquered death, his Resurrection, and Ascension to the right hand of the Father. Doxology, the praise of God, arises from this "marvelous work" of the whole economy of salvation.
Source: Catechism of the Catholic Church (Vatican.va)