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The sacred is not something simply merely separated from the world; rather the sacred transforms elements of the world to a transcendent purpose. The Eucharist is the most outstanding example: what was ordinary food for the Hebrews was transformed into the Passover meal; this, in turn was transformed into the Body and Blood of Christ. Bread and wine, elements of natural nourishment, progressively became transcendent, supernatural, saving nourishment. In my study of the Medieval Sarum Rite of England, I concluded that, contrary to the theorists of comparative religion, who looked to the opposition of sacred and profane (in the sense of secular), the medieval (and Christian) sense of the sacred was that the important differences were between the more sacred and the less sacred, and the continuity of these was more important that their opposition.
In music, the transformation of elements of our ordinary world conveys the message that our ordinary lives can also be transformed. The hitch is: what if the incorporation of music into the liturgy does not involve a discernable transformation? What if the use of styles clearly identifiable with worldly and secular purposes retain their identity in liturgical use? Is the message, then, that there is no transformation? that the secular life-styles are all that there is? I would contend that this is the danger of the present use of secular styles, since the instruments they use, their vocal styling, their simplistic musical construction all retain their secular identity. Rather, it is crucial that whatever musical styles are used in the liturgy, there be clear elements of their sacralization, that their incorporation is unambiguously for the sake of transformation into something sacred. The regular use of a few pieces of Gregorian chant and of sacred polyphony can be enough to signal that difference, to inspire a congregation to higher purposes in their participation in the liturgy.