He has been describing the various divisions of the tetrachord according to the theory of Aristoxenus, and adds that there were anciently other divisions in use.
The new notes are named like those of the adjoining tetrachord of the original octave, but with the name of the tetrachord added by way of distinction.
So far Aristides is doubtless right, since Aristoxenus himself says that the divisions of the tetrachord are theoretically infinite in number (p.
More probably it meant simply the octave scale, in contrast to the tetrachord and pentachord--a sense in which it is used by Aristides Quintilianus, p.
The moveable notes are those which, being arranged in the tetrachord between the immoveable, change from place to place according to the different classes.
In the enharmonic, the tetrachordconsists of two tones and two "dieses.
Or finally, by the employment of two tones one might proceed to the familiar Diatonic genus, which divided the tetrachord into two tones and a semitone.
As a succession of three whole tones would form the disagreeable and untunable interval of a tritonus, two whole tones and a half-tone were tuned, fixing the tetrachord in the consonant interval of the perfect fourth.
The basis of the tetrachord is the employment of the thumb and first three fingers of the left hand to twang as many strings, the little finger not being used on account of natural weakness.
In melodious sequence the Greek tetrachord is decidedly more agreeable to the ear than the corresponding series of our equal temperament.
By taking the lowest note of the Mixolydian, B, and forming a Dorian tetrachord on it, B C D E were acquired.
As yet, however, this scale allowed of no transposition of a mode to another pitch; in order to accomplish this the second tetrachord was used as the first of another similar system.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "tetrachord" in a variety of sentences. We hope that you will now be able to make sentences using this word.
