Gregorian modes

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Related to Gregorian modes: Church modes
the musical scales ordained by Pope Gregory the Great, and named after the ancient Greek scales, as Dorian, Lydian, etc.

See also: Gregorian

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Using Gregorian modes rather than modern scales, Rees was keen that his music should be tuneful, encouraging people to sing as they had in his childhood.