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| | How was the tritone used? |
 | | Note, by the way, that these are not equal intervals in Pythagorean tuning, and that the diminished fifth (about 588 cents, 588/1200 octave) is smaller than the augmented fourth (about 612 cents -- as opposed to the even 600 cents for both intervals in the 12-tone equally tempered scale). |
 | | As modern writers have suggested, in a context of early organum around the 9th-10th centuries with parallel fifths and fourths predominating, an augmented fourth or diminished fifth might be heard as a kind of a "Wolf" -- that is, an interval which seems an "out-of-tune" variant on an expected concord. |
 | | In a medieval context, where fifths and fourths are the most complex stable intervals, the tritone is unique among the usual intervals in neither being itself stable, nor in being to resolve to any stable interval by conjunct contrary motion: compare 2-4, 3-1 or 3-5, 6-8 or 6-4, and 7-5. |
| www.medieval.org /emfaq/harmony/tritone.html (2110 words) |
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