In the early 1950s the Jesuit priest Joseph Gelineau was active in liturgical development in several movements leading toward Vatican II.
The General Instruction of the Roman Missal states:Great importance should ... be attached to the use of singing in the celebration of the Mass, with due consideration for the culture of the people and abilities of each liturgical assembly.
Other types of sacred music, in particular polyphony, are in no way excluded, provided that they correspond to the spirit of the liturgical action and that they foster the participation of all the faithful.
Since the faithful from different countries come together ever more frequently, it is fitting that they know how to sing together at least some parts of the Ordinary of the Mass in Latin, especially the Creed and the Lord's Prayer, set to the simpler melodies.
[5] It was based around a hymn in honor of the Peruvian saint Martin de Porres, two other short works, "Anima Christi" and "Praise the Lord".
[7] The Communion Hymn was Clarence Rivers' "God is Love", which combined Gregorian Chant with the melodic patterns and rhythms of Negro Spirituals.
[14] The vernacular Mass texts have also drawn composers who stand outside the dominant folk–popular music tradition, such as Giancarlo Menotti and Richard Proulx.
Cardinal William Levada who became Prefect for the Congregation for the Doctrine of the Faith in the Roman Curia was a former member of the board of directors.
What its advocates call a direct and accessible style of music gives participation of the gathered community higher priority than the beauty added to the liturgy by a choir skilled in polyphony.
On this basis it has been argued that the adoption of the more popular musical styles is alien to the Roman Rite, and weakens the distinctiveness of Catholic worship.
[26] Pundit George Weigel said that "[a]n extraordinary number of trashy liturgical hymns have been written in the years since the Second Vatican Council."