Song, is that which ariseth from mu∣sical sounds or Monads conjoyned accor∣ding to three Dimensions.
And it is either primary or secondary.
The primary is called harmony and consonancy, which doth arise from grave and acute sounds united by such a pro∣portion, that it may delight the hearing.
The secondary is dissonancy or Anar∣mosty, which ariseth from such a propor∣tion of grave and acute Sounds, that it offendeth the hearing.
And this double part is either a musi∣cal Dyas, or Tryas, of which the one is perfect, and the other imperfect.
A musical Dyas, is that which ariseth from two sounds: consonant and harmo∣nical from Consonants, and dissonant from Dissonants.
And it is more simple, or more com∣pounded. That is called radical, this radicated.
The simple Consonant Dyads, are seven, viz. An Octave, Fifth, Fourth, Ditone, Semiditone, greater Sixth, and lesser Sixth: the dissonant Dyads are the other simple Intervalls, as the Tone major and minor, the Semitone greater and lesser, the Seventh