Gregorian Chant , Et Lux in Tenebris...

And the light shineth in darkness: and the darkness did not comprehend it.//et lux in tenebris lucet et tenebrae eam non conprehenderunt.../erat lux vera quae inluminat omnem hominem venientem in mundum/...That was the true light, which enlighteneth every man that cometh into this world./
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Gregorian Chant is a musical repertory made up of chants used in the liturgical services of the Roman Catholic Church. In fact, the liturgical tradition which the Church has given us is a vocal, monophonic music composed in Latin using sacred texts from the Ancient and New Testaments. This is why Gregorian Chant has often been called a "sung Bible". Linked intimately to the liturgy in this way, the goal of the Gregorian melodies is to favor spiritual growth, reveal the gifts of God and the full coherence of the Christian message.
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What we call Gregorian chant today first appears distinctly in the Roman repertory of the fifth and sixth centuries. Its implimentation and perhaps some of its composition was in the hands of a group of ministers in a service specially dedicated to the Roman basilicas, the schola cantorum. Gregorian chant also appears to have been an aural music, that is, transmitted by ear and committed to memory - like all other music of the world at the time.
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www.solesmes.com/GB/gregorien/hist.php?js=1