IMPORTANT NOTE. - As we have already said, the dynamic value or
strength of the ictus or rhythmic step varies considerably. Sometimes it is strong, sometimes weak; everything depends on the syllable to which it corresponds and the position it occupies in the melody (a). The fact therefore that this intensity varies is a proof that the ictus belongs not to the dynamic but to the rhythmic order; its being and influence are contributed and felt by elements from the melody and the text. The expression " the ictus is more in the mind than in the voice", has sometimes been misunderstood. The meaning will, perhaps, be clearer if we say that it is felt and intimated by tone of voice rather than expressed by any material emphasis. "When in addition to the independence of rhythm and intensity, we consider that the Latin accent is light, lifted up and rounded off like an arch, is not heavy or strongly stressed, is arsic and not thetic, we shall not be surprised to meet frequently in Plainsong accented syllables outside and independent of the ictus or rhythmic step, (a) Indeed the Plainsong masterpieces of the golden age clearly assert this independence. And this is perfectly musical, in full accord with the genius of the Latin language and the Roman pronunciation and accentuation so much desired by Pius X. To place the ictus or rhythmic step always and necessarily on the accented syllable, as modern musicians are wont to do in another idiom, would be, we maintain, to spoil the rhythm and melody, accent and words of our venerable melodies.
(a) It is well known that from the text point of view the syllable or syllables after the accent must be relatively weak, while from the melodic point of view the great rule is: a slight and gentle crescendo in the ascending, and a similar decrescendo in the descending parts. This must always be done without sharp contrast! or exaggeration of any kind.
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