| Later
on, Safi al-Dîn divides the intervals he made up into two as consonants
and dissonants. (5)
He divides the consonants ones into two as first level consonants and second
level consonants. |
| |
| 1.
Octave intervals; the major consonant and the most natural one of the intervals.
|
| |
| 2.
Second level consonant intervals; two octave, octave and pentachord, octave
and tetrachord intervals. |
| Then
comes pentachord and tetrachord. The intervals of 5/4, 6/5 and 7/6 out of
these are the weak consonant intervals. As for the small lahnî, the
most consonants of them are 8/7 and 9/8. He points out that as the intervals
get smaller, so does the weakness. (6) |