One of the great--if not the great--aspect of "Sing To The Lord" is that it clearly replaces Music in Catholic Worship, which means that the following words from MCW are no longer applicable in any respect. And if you seek answers to what has happened in the last several decades to Catholic music, consider these now-defunct selected paragraphs:
The former distinction between the ordinary and proper parts of the Mass with regard to musical settings and distribution of roles is no longer retained. For this reason the musical settings of the past are usually not helpful models for composing truly liturgical pieces today....
A type of celebration suitable for a youth group may not fit in a retirement home; a more formal style effective in a parish church may be inappropriate in a home liturgy. The music used should be within the competence of most of the worshipers. It should suit their age.level, cultural background, and level of faith....
The diversity of people present at a parish liturgy gives rise to a further problem. Can the same parish liturgy be an authentic expression for a grade school girl, her college.age brother, their married sister with her young family, their parents and grandparents? Can it satisfy the theologically and musically educated along with those lacking in training? Can it please those who seek a more informal style of celebration? The planning team must consider the general makeup of the total community....
Good music of new styles is finding a happy home in the celebrations of today. To chant and polyphony we have effectively added the chorale hymn, restored responsorial singing to some extent, and employed many styles of contemporary composition. Music in folk idiom is finding acceptance in eucharistic celebrations. We must judge value within each style...
Visually it is desirable that the choir appear to be part of the worshiping community, yet a part which serves in a unique way. Locating the organ console too far from the congregation causes a time lag which tends to make the singing drag unless the organist is trained to cope with it. A location near the front pews will facilitate congregational singing.