GREEK MODES
\ɡɹˈiːk mˈə͡ʊdz], \ɡɹˈiːk mˈəʊdz], \ɡ_ɹ_ˈiː_k m_ˈəʊ_d_z]\
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or divisions of the interval between two octaves, were fifteen, the Principal, or Authentic, being five : viz. Dorian, from D to D, with us ; Ionian, or Jastian, Eb to E b ; Phrygian, E ; Aeolian, F ; Lydian, F #. From these were constructed all the Church M. of Plain song, Plagal [Gr.] M. being added, formed from Authentic, by taking the fourth below as a new key-note. Thus, Hypo-Dorian is our A. Authentic M. were also distinguished as Hyper- ; e.g. Dorian is i.q. Hyper-Dorian. (But Hyper- has not uniformly this meaning.)
By Henry Percy Smith