Hypoionian mode

The Hypoionian mode, literally meaning "below Ionian", is the name assigned by Henricus Glareanus in his Dodecachordon (1547) to the plagal mode on C, which uses the diatonic octave species from G to the G an octave higher, divided at its final, C. This is roughly the same as playing all the white notes of a piano from G to G: G A B C | (C) D E F G (Powers 2001, 37).