Cuthbert chords: Difference between revisions
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'''Cuthbert chords''' are [[essentially tempered dyadic chord]]s tempered by the cuthbert comma, [[847/845]]. | '''Cuthbert chords''' are [[essentially tempered dyadic chord]]s tempered by the cuthbert comma, [[847/845]]. | ||
Cuthbert chords are of [[Dyadic chord/Pattern of essentially tempered chords|pattern 1a]] in the 2.5.7.11.13 [[subgroup]] [[13-odd-limit]], meaning that there are 3 triads, 6 tetrads and 2 pentads, for a total of 11 distinct chord structures. | |||
The most basic cuthbert triad is a palindrome, consisting of two [[13/11]]'s making up [[7/5]], which implies tempering by cuthbert, the 847/845 comma. It is, in other words, the 847/845-tempered version of | |||
* 1-13/11-7/5 with steps 13/11-13/11-10/7. | * 1-13/11-7/5 with steps 13/11-13/11-10/7. | ||
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* 1-14/13-13/11 with steps 14/13-11/10-22/13. | * 1-14/13-13/11 with steps 14/13-11/10-22/13. | ||
They can be extended to the following tetrads, with two palindromic chords and two pairs of chords in inverse relationship. The palindromic | They can be extended to the following tetrads, with two palindromic chords and two pairs of chords in inverse relationship. The palindromic tetrads are | ||
* 1-11/10-13/11-13/10 chord with steps 11/10-14/13-11/10-20/13; | * 1-11/10-13/11-13/10 chord with steps 11/10-14/13-11/10-20/13; | ||
* 1-14/13-13/11-14/11 chord with steps 14/13-11/10-14/13-11/7. | * 1-14/13-13/11-14/11 chord with steps 14/13-11/10-14/13-11/7. | ||
The inversely related pairs of | The inversely related pairs of tetrads are | ||
* 1-13/11-14/11-7/5 with steps 13/11-14/13-11/10-10/7, and its inverse | * 1-13/11-14/11-7/5 with steps 13/11-14/13-11/10-10/7, and its inverse | ||
* 1-11/10-13/11-7/5 with steps 11/10-14/13-13/11-10/7; | * 1-11/10-13/11-7/5 with steps 11/10-14/13-13/11-10/7; | ||
Line 18: | Line 20: | ||
* 1-14/13-13/11-7/5 with steps 14/13-11/10-13/11-10/7. | * 1-14/13-13/11-7/5 with steps 14/13-11/10-13/11-10/7. | ||
Then there | Then there is an inversely related pair of pentads: | ||
* 1-11/10-13/11-13/10-7/5 with steps 11/10-14/13-11/10-14/13-10/7, and its inverse | * 1-11/10-13/11-13/10-7/5 with steps 11/10-14/13-11/10-14/13-10/7, and its inverse | ||
* 1-14/13-13/11-14/11-7/5 with steps 14/13-11/10-14/13-11/10-10/7. | * 1-14/13-13/11-14/11-7/5 with steps 14/13-11/10-14/13-11/10-10/7. |