Although corresponding plagal and authentic modes have the same final, they have different dominants.

The reciting tones of all authentic modes began a fifth above the final, with those of the plagal modes a third above.

In the authentic modes it is the third of the scale, unless that note should happen to be B, in which case C substitutes for it.

The idea of the train as a far more authentic and civilised - not to mention non-lethal - mode of travel was seductive.

The plagal modes have the final in the middle of the ambitus, while the authentic modes generally go no more than one note below the final.

From an artistically conservative standpoint, some practitioners believe that the use of film offers a more authentic mode of expression than with easily enhanced digital images.

This mode is the plagal counterpart of the authentic fifth mode.

This mode is the plagal counterpart of the authentic first mode, which was also called Dorian.

However, they are numbered differently, the authentic modes being 1, 2, 3, 4 (Anon.

This mode is the plagal counterpart of the authentic third mode, which was called Phrygian.