7edo: Difference between revisions
Wikispaces>guest **Imported revision 235651124 - Original comment: ** |
Wikispaces>xenwolf **Imported revision 235945478 - Original comment: ** |
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<h2>IMPORTED REVISION FROM WIKISPACES</h2> | <h2>IMPORTED REVISION FROM WIKISPACES</h2> | ||
This is an imported revision from Wikispaces. The revision metadata is included below for reference:<br> | This is an imported revision from Wikispaces. The revision metadata is included below for reference:<br> | ||
: This revision was by author [[User: | : This revision was by author [[User:xenwolf|xenwolf]] and made on <tt>2011-06-11 13:10:02 UTC</tt>.<br> | ||
: The original revision id was <tt> | : The original revision id was <tt>235945478</tt>.<br> | ||
: The revision comment was: <tt></tt><br> | : The revision comment was: <tt></tt><br> | ||
The revision contents are below, presented both in the original Wikispaces Wikitext format, and in HTML exactly as Wikispaces rendered it.<br> | The revision contents are below, presented both in the original Wikispaces Wikitext format, and in HTML exactly as Wikispaces rendered it.<br> | ||
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|| 7 || 1028,571 || seventh || 10,975 c from (Didymus) minor seventh 9/5 | || 7 || 1028,571 || seventh || 10,975 c from (Didymus) minor seventh 9/5 | ||
-3,216 c from seventh 49/27 | -3,216 c from seventh 49/27 | ||
-6,425 c from neutral seventh 20/11 || | -6,425 c from neutral seventh 20/11 | ||
1,006 c from the 29th harmonic 29/16 || | |||
|| 8 || 1200.0 || eighth || exactly 2/1 || | || 8 || 1200.0 || eighth || exactly 2/1 || | ||
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<br /> | <br /> | ||
Similarly, in equi-heptatonic systems the desire for harmonic sound may dictate constant adjustments of intonation away from the theoretical interval of 171 cents. One of the most impressive areas in Africa in which a pen-equidistant heptatonic scale is combined with a distinctively harmonic style based on singing in intervals of thirds plus fifths, or thirds plus fourths, is the eastern Angolan culture area. This music is heptatonic and non-modal; i.e., there is no concept of major or minor thirds as distinctive intervals. In principle all the thirds are neutral, but in practice the thirds rendered by the singers often approximate natural major thirds (386 cents), especially at points of rest. In this manner, the principles of equidistance and harmonic euphony are accommodated within one tonal-harmonic system. For the notation of such music, a seven-line stave is most appropriate, with each horizontal line representing one pitch level.<br /> | Similarly, in equi-heptatonic systems the desire for harmonic sound may dictate constant adjustments of intonation away from the theoretical interval of 171 cents. One of the most impressive areas in Africa in which a pen-equidistant heptatonic scale is combined with a distinctively harmonic style based on singing in intervals of thirds plus fifths, or thirds plus fourths, is the eastern Angolan culture area. This music is heptatonic and non-modal; i.e., there is no concept of major or minor thirds as distinctive intervals. In principle all the thirds are neutral, but in practice the thirds rendered by the singers often approximate natural major thirds (386 cents), especially at points of rest. In this manner, the principles of equidistance and harmonic euphony are accommodated within one tonal-harmonic system. For the notation of such music, a seven-line stave is most appropriate, with each horizontal line representing one pitch level.<br /> | ||
<u><em>(&quot;African music.&quot; Encyclopædia Britannica. 2009. Encyclopædia Britannica Online. 05 Jul. 2009 &lt;<!-- ws:start:WikiTextUrlRule: | <u><em>(&quot;African music.&quot; Encyclopædia Britannica. 2009. Encyclopædia Britannica Online. 05 Jul. 2009 &lt;<!-- ws:start:WikiTextUrlRule:653:http://www.britannica.com/EBchecked/topic/719112/African-music --><a class="wiki_link_ext" href="http://www.britannica.com/EBchecked/topic/719112/African-music" rel="nofollow">http://www.britannica.com/EBchecked/topic/719112/African-music</a><!-- ws:end:WikiTextUrlRule:653 -->&gt;.</em></u>)<br /> | ||
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A Thai xylophone measured by Morton (1974) &quot;varied only plus or minus 5 cents,&quot; from 7-TET. A Ugandan Chopi xylophone measured by Haddon (1952) was also tuned to this system.<br /> | A Thai xylophone measured by Morton (1974) &quot;varied only plus or minus 5 cents,&quot; from 7-TET. A Ugandan Chopi xylophone measured by Haddon (1952) was also tuned to this system.<br /> | ||
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-3,216 c from seventh 49/27<br /> | -3,216 c from seventh 49/27<br /> | ||
-6,425 c from neutral seventh 20/11<br /> | -6,425 c from neutral seventh 20/11<br /> | ||
1,006 c from the 29th harmonic 29/16<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
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Step from seventh to octave is too large for the leading tone.<br /> | Step from seventh to octave is too large for the leading tone.<br /> | ||
<!-- ws:start:WikiTextHeadingRule:14:&lt;h2&gt; --><h2 id="toc7"><a name="x7 Equal Divisions of the Octave-Relative tuning accuracy"></a><!-- ws:end:WikiTextHeadingRule:14 -->Relative tuning accuracy</h2> | <!-- ws:start:WikiTextHeadingRule:14:&lt;h2&gt; --><h2 id="toc7"><a name="x7 Equal Divisions of the Octave-Relative tuning accuracy"></a><!-- ws:end:WikiTextHeadingRule:14 -->Relative tuning accuracy</h2> | ||
7-edo is the third Zeta function integral tuning, see <!-- ws:start:WikiTextUrlRule: | 7-edo is the third Zeta function integral tuning, see <!-- ws:start:WikiTextUrlRule:654:http://www.research.att.com/~njas/sequences/A117538 --><a class="wiki_link_ext" href="http://www.research.att.com/~njas/sequences/A117538" rel="nofollow">http://www.research.att.com/~njas/sequences/A117538</a><!-- ws:end:WikiTextUrlRule:654 --><br /> | ||
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<!-- ws:start:WikiTextHeadingRule:16:&lt;h3&gt; --><h3 id="toc8"><!-- ws:end:WikiTextHeadingRule:16 --> </h3> | <!-- ws:start:WikiTextHeadingRule:16:&lt;h3&gt; --><h3 id="toc8"><!-- ws:end:WikiTextHeadingRule:16 --> </h3> | ||