User:Moremajorthanmajor/Ed9/4
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IMPORTED REVISION FROM WIKISPACES
This is an imported revision from Wikispaces. The revision metadata is included below for reference:
- This revision was by author JosephRuhf and made on 2016-12-09 10:46:17 UTC.
- The original revision id was 601788218.
- The revision comment was:
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Original Wikitext content:
<span style="font-size: 19.5px;">Division of a ninth (e. g. 9/4) into n equal parts</span> Division of e. g. the 9:4 into equal parts can be conceived of as to directly use this interval as an equivalence, or not. The question of [[equivalence]] has not even been posed yet. The utility of 9:4 or another ninth as a base though, is apparent by being the standard replacement for the root in jazz piano voicings. Also, as a ninth is the double of a fifth, the fifth of normal root position triads will become the common suspension of a ninth-based system. However, thirds and sixths are no longer inverses, and thus an octatonic scale (especially those of the proper Napoli temperament family which are generated by a third or a fourth optionally with a period of a [wolf] fifth wider than equal to the 17edo tritone) takes 1-3-6 as the root position of its regular triad. Many, though not all, of these scales have a pseudo (false) octave, with various degrees of accuracy, but which context(s), if any, it is very perceptually important in is as yet an open question. Incidentally, one way to treat 9/4 as an equivalence is the use of the 4:5:6:7:[8]:(9) chord as the fundamental complete sonority in a very similar way to the 4:5:6:(8) chord in meantone. Whereas in meantone it takes four 3/2 to get to 5/1, here it takes nine 5/4 to get to the same place as thirteen 7/6 (tempering out the comma |5 -13 9 -13>) or three 7/6 to get between 6/5 and the period of 3/2 (tempering out the comma 1728/1715). So, doing this yields 8 or 10, 12 or 14, and 22 note 2MOS. While the notes are rather farther apart, the scheme is uncannily similar to the "equally" tempered shrutis. "Macroshrutis" might be a practically perfect term for it if it hasn't been named yet. The branches of the Napoli family are named thus: Bipentachordal: * 4&4: Macrodiminshed * 6&2: Macroshrutis 5&3: Grandfather
Original HTML content:
<html><head><title>edIX</title></head><body><span style="font-size: 19.5px;">Division of a ninth (e. g. 9/4) into n equal parts</span><br /> <br /> <br /> Division of e. g. the 9:4 into equal parts can be conceived of as to directly use this interval as an equivalence, or not. The question of <a class="wiki_link" href="/equivalence">equivalence</a> has not even been posed yet. The utility of 9:4 or another ninth as a base though, is apparent by being the standard replacement for the root in jazz piano voicings. Also, as a ninth is the double of a fifth, the fifth of normal root position triads will become the common suspension of a ninth-based system. However, thirds and sixths are no longer inverses, and thus an octatonic scale (especially those of the proper Napoli temperament family which are generated by a third or a fourth optionally with a period of a [wolf] fifth wider than equal to the 17edo tritone) takes 1-3-6 as the root position of its regular triad. Many, though not all, of these scales have a pseudo (false) octave, with various degrees of accuracy, but which context(s), if any, it is very perceptually important in is as yet an open question.<br /> <br /> Incidentally, one way to treat 9/4 as an equivalence is the use of the 4:5:6:7:[8]:(9) chord as the fundamental complete sonority in a very similar way to the 4:5:6:(8) chord in meantone. Whereas in meantone it takes four 3/2 to get to 5/1, here it takes nine 5/4 to get to the same place as thirteen 7/6 (tempering out the comma |5 -13 9 -13>) or three 7/6 to get between 6/5 and the period of 3/2 (tempering out the comma 1728/1715). So, doing this yields 8 or 10, 12 or 14, and 22 note 2MOS. While the notes are rather farther apart, the scheme is uncannily similar to the "equally" tempered shrutis. "Macroshrutis" might be a practically perfect term for it if it hasn't been named yet.<br /> <br /> The branches of the Napoli family are named thus:<br /> Bipentachordal:<br /> <ul><li>4&4: Macrodiminshed</li><li>6&2: Macroshrutis</li></ul>5&3: Grandfather</body></html>