ECCLESIASTICAL
Dictionary of Science, Literature and Art · 1854 · p. 32
In Music, the eight modes now generally called the Greg or i an Chant, in which the service of the Catholic church is performed; four whereof are authentic, and four of them plagal. Pope Gregory has been considered the inventor of them. They are the foundation of all music, and will ever be considered stupenduous monuments of composition. [s. 1266]
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