A compilation of the practical rules and methods required to perform this ancient form of church music.

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In each Tone (as distinct from Mode) there are five tones and two semitones, but the position of the semitones (MI-FA and SI-DO) varies.
There are some melodies which do not strictly conform to these Tones, e.g. the Psalm In Exitu has its special tone (for Lent) with LA for Dominant in the first half of each verse, and SOL for Dominant in the second half; and some other melo­dies terminate in LA and others in DO.
Again, the melody sometimes exceeds the limits of its Tone scale and is then said to be superabundant'; while sometimes it is deficient either in the Final or in the Dominant, and is then irregular; while at other times the Authentic and Plagal tones are found together in the same melody, which is then said to be mixed.
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