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15 CHAPTER II.
THE MODES OR TONES
The Modes or Tones are the names given to the result of an attempt to classify the melodies of Plain Chant.
These four Modes ended respectively on RE, MI, FA, SOL.
Each group or Mode*, which had a possible range of eleven notes, was divided into two scales called authentic and plagal respectively, of an octave apiece (diapason) , the middle five notes out of the eleven being common to both scales. The Final of each mode is also called the Tonic or the Fundamental,
The Dominant is marked, in the follow-ing scheme with an asterisk.