The attention my Predecessors thus paid to this delicate sector was constant. They recalled the fundamental principles that must enliven the composition of sacred music, especially when it is destined for the Liturgy. Besides Pope St Pius X, other Popes who deserve mention are Benedict XIV with his Encyclical Annus Qui (19 February 1749), Pius XII with his Encyclicals Mediator Dei (20 November 1947) and Musicae Sacrae Disciplina (25 December 1955), and lastly Paul VI, with the luminous statements that punctuated many of his Speeches.

I have also stressed the need to "purify worship from ugliness of style, from distasteful forms of expression, from uninspired musical texts which are not worthy of the great act that is being celebrated"[10], to guarantee dignity and excellence to liturgical compositions.

4. In continuity with the teachings of St Pius X and the Second Vatican Council, it is necessary first of all to emphasize that music destined for sacred rites must have holiness as its reference point: indeed, "sacred music increases in holiness to the degree that it is intimately linked with liturgical action"[11]. For this very reason, "not all without distinction that is outside the temple (profanum) is fit to cross its threshold", my venerable Predecessor Paul VI wisely said, commenting on a Decree of the Council of Trent[12]. And he explained that "if music - instrumental and vocal - does not possess at the same time the sense of prayer, dignity and beauty, it precludes the entry into the sphere of the sacred and the religious"[13]. Today, moreover, the meaning of the category "sacred music" has been broadened to include repertoires that cannot be part of the celebration without violating the spirit and norms of the Liturgy itself.

St Pius X's reform aimed specifically at purifying Church music from the contamination of profane theatrical music that in many countries had polluted the repertoire and musical praxis of the Liturgy. In our day too, careful thought, as I emphasized in the Encyclical Ecclesia de Eucharistia, should be given to the fact that not all the expressions of figurative art or of music are able "to express adequately the mystery grasped in the fullness of the Church's faith"[14]. Consequently, not all forms of music can be considered suitable for liturgical celebrations.

5. Another principle, affirmed by St Pius X in the Motu Proprio Tra le Sollecitudini and which is closely connected with the previous one, is that of sound form. There can be no music composed for the celebration of sacred rites which is not first of all "true art" or which does not have that efficacy "which the Church aims at obtaining in admitting into her Liturgy the art of musical sounds"[15].

Yet this quality alone does not suffice. Indeed, liturgical music must meet the specific prerequisites of the Liturgy: full adherence to the text it presents, synchronization with the time and moment in the Liturgy for which it is intended, appropriately reflecting the gestures proposed by the rite. The various moments in the Liturgy require a musical expression of their own. From time to time this must fittingly bring out the nature proper to a specific rite, now proclaiming God's marvels, now expressing praise, supplication or even sorrow for the experience of human suffering which, however, faith opens to the prospect of Christian hope.

In this regard St Pius X pointed out - using the term universal - a further prerequisite of music destined for worship: "...while every nation", he noted, "is permitted to admit into its ecclesiastical compositions those special forms which may be said to constitute its native music, still these forms must be subordinate in such a manner to the general character of sacred music, that nobody of any nation may receive an impression other than good on hearing them"[16]. In other words, the sacred context of the celebration must never become a laboratory for experimentation or permit forms of composition and performance to be introduced without careful review.

12. With regard to compositions of liturgical music, I make my own the "general rule" that St Pius X formulated in these words: "The more closely a composition for church approaches in its movement, inspiration and savour the Gregorian melodic form, the more sacred and liturgical it becomes; and the more out of harmony it is with that supreme model, the less worthy it is of the temple"[33]. It is not, of course, a question of imitating Gregorian chant but rather of ensuring that new compositions are imbued with the same spirit that inspired and little by little came to shape it.