Modality is not a difficult concept to grasp, when one understands that it is practical in nature. Since the early centuries of the Church, a very common format for Gregorian chant was: Antiphon—Psalm verse—Antiphon—Psalm verse—Antiphon, etc. Needless to say, it was very important that the Antiphon connected nicely with the Psalm verse, and vice versa. […]
