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start:
09 january 2007, up-date: 09 january 2007
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| II. Second Discourse of al-Sharafiyyah |
| (The Ratios of Numbers to Each Other, Making Up of Intervals, The Ratio of The Intervals Made Up, The Levels and Names of Consonance and Dissonance) |
| 1. The Ratio Between the Numbers |
| 2. The Names of the Intervals |
| 3. The Parts of Intervals |
| 4. Consonant and Dissonant Intervals |