Plagal mode
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Plagal mode refers to the notes of a plagal mode lying on either side of the final, beginning on the dominant (a tone of a fourth below the keynote of the authentic church mode) and then up to its key octave.
Under Pope Gregory I, the original four plagal modes were, in modern terms, A Aeolian, B Locrian, C Ionian, and D Dorian. The tonics of these scales, however, was the fourth degree of the scale.
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