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Charlemagne encouraged the preservation of gregorian chant manuscripts and established music as part of the catholic church religous ceremonies.
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Musica Enchiriadis was an anonymous treatise about the composition of organum and polyphonic music.
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Guido of Arezzo discussed singing and teaching practices for gregorian chant, including the four line staff, relative pitch, and sight singing.
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Ars Cantus Mensurabilis was a treatise that defined consonant and dissonant intervals.
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A treatise by Philippe de Vitry that established notated rythm with time and prolation.
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