The '''orwell tetrad''' is a [[tetrad|four-note chord]] which in close position (reduced to the octave) consists of a chain of three [[subminor]] thirds, thirds of approximately [[7/6]] in size, and a major third, of approximately [[5/4]] in size, which closes at the [[octave]] since the orwell comma, [[1728/1715]], is [[tempered out]]; in other words, a 7/6-7/6-7/6-5/4 chord. This chord contains two fifths that are flattened by [[36/35]], which is about a [[quartertone]]. Equal temperaments tempering out 1728/1715 and hence containing orwell tetrads include {{EDOs| 22, 26, 27, 31, 53, 58, 80, 84, 111 and 137 }}.
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<h4>Original Wikitext content:</h4>
<div style="width:100%; max-height:400pt; overflow:auto; background-color:#f8f9fa; border: 1px solid #eaecf0; padding:0em"><pre style="margin:0px;border:none;background:none;word-wrap:break-word;white-space: pre-wrap ! important" class="old-revision-html">The **orwell tetrad** is a four-note chord which in close position (reduced to the octave) consists of a chain of three subminor thirds, thirds of approximately 7/6 in size, and a major third, of approximately 5/4 in size, which closes at the octave since the orwell comma, 1728/1715, is tempered out; in other words, a 7/6-7/6-7/6-5/4 chord. Equal temperaments tempering out 1728/1715 and hence containing orwell tetrads include 22, 26, 27, 31, 53, 58, 80, 84, 111 and 137.
The orwell tetrad can in a natural way be extended to the [[11-limit]] as 1-7/6-11/8-8/5 by tempering out 99/98, a comma of 11-limit [[orwell]]. With a bit more accuracy, tempering out 176/175 and so also 540/539 allows it to be seen as the [[Orwellismic family#Guanyin|guanyin]] tetrad, a tempered version of 1-7/6-15/11-8/5. Equal temperaments with guanyin tetrads include 22, 31, 53, 58, 80 and 111. In orwell temperament, where 121/120 is tempered out, the guanyin and orwell tetrads are the same.
[[File:OrwellTetrad22edo.mp3]]
The tetrad can be extended to a 15-limit nonad, the orwell-tempered version of 1-11/10-7/6-9/7-11/8-3/2-8/5-7/4-15/8, with steps of size 11/10-15/14-11/10-15/14-11/10-15/14-11/10-15/14-15/14. The orwell nonad is the same as the Orwell[9] MOS, considered as a chord. Since it can be considered to be a chord, it is possible to retune music from 12edo to Orwell[9] by using [[orwell9-12|this scale]]. Examples of music retuned in this way are given below:
The orwell tetrad can in a natural way be extended to the [[11-limit]] as 1–7/6–11/8–8/5 by tempering out [[99/98]], a comma of 11-limit [[orwell]]. With a bit more accuracy, tempering out [[176/175]] and so also [[540/539]] allows it to be seen as the [[Orwellismic family #Guanyin|guanyin]] tetrad, a tempered version of 1–7/6–15/11–8/5. Equal temperaments with guanyin tetrads include {{EDOs| 22, 31, 53, 58, 80 and 111 }}. In orwell temperament, where [[121/120]] is tempered out, the guanyin and orwell tetrads are the same.
The tetrad can be extended to a [[15-odd-limit]] ennead, the orwell-tempered version of
<h4>Original HTML content:</h4>
* 1–11/10–7/6–9/7–11/8–3/2–8/5–7/4–15/8, with steps of size 11/10, 15/14, 11/10, 15/14, 11/10, 15/14, 11/10, 15/14, 15/14.
<div style="width:100%; max-height:400pt; overflow:auto; background-color:#f8f9fa; border: 1px solid #eaecf0; padding:0em"><pre style="margin:0px;border:none;background:none;word-wrap:break-word;width:200%;white-space: pre-wrap ! important" class="old-revision-html"><html><head><title>orwell tetrad</title></head><body>The <strong>orwell tetrad</strong> is a four-note chord which in close position (reduced to the octave) consists of a chain of three subminor thirds, thirds of approximately 7/6 in size, and a major third, of approximately 5/4 in size, which closes at the octave since the orwell comma, 1728/1715, is tempered out; in other words, a 7/6-7/6-7/6-5/4 chord. Equal temperaments tempering out 1728/1715 and hence containing orwell tetrads include 22, 26, 27, 31, 53, 58, 80, 84, 111 and 137. <br />
<br />
The orwell ennead is the same as the Orwell[9] [[mos]], considered as a chord. Since it can be considered to be a chord, it is possible to retune music from [[12edo]] to Orwell[9] by using the [[orwell9-12]] scale. Examples of music retuned in this way are given below:
The orwell tetrad can in a natural way be extended to the <a class="wiki_link" href="/11-limit">11-limit</a> as 1-7/6-11/8-8/5 by tempering out 99/98, a comma of 11-limit <a class="wiki_link" href="/orwell">orwell</a>. With a bit more accuracy, tempering out 176/175 and so also 540/539 allows it to be seen as the <a class="wiki_link" href="/Orwellismic%20family#Guanyin">guanyin</a> tetrad, a tempered version of 1-7/6-15/11-8/5. Equal temperaments with guanyin tetrads include 22, 31, 53, 58, 80 and 111. In orwell temperament, where 121/120 is tempered out, the guanyin and orwell tetrads are the same.<br />
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== Sound examples ==
The tetrad can be extended to a 15-limit nonad, the orwell-tempered version of 1-11/10-7/6-9/7-11/8-3/2-8/5-7/4-15/8, with steps of size 11/10-15/14-11/10-15/14-11/10-15/14-11/10-15/14-15/14. The orwell nonad is the same as the Orwell[9] MOS, considered as a chord. Since it can be considered to be a chord, it is possible to retune music from 12edo to Orwell[9] by using <a class="wiki_link" href="/orwell9-12">this scale</a>. Examples of music retuned in this way are given below:<br />
The orwell tetrad is a four-note chord which in close position (reduced to the octave) consists of a chain of three subminor thirds, thirds of approximately 7/6 in size, and a major third, of approximately 5/4 in size, which closes at the octave since the orwell comma, 1728/1715, is tempered out; in other words, a 7/6-7/6-7/6-5/4 chord. This chord contains two fifths that are flattened by 36/35, which is about a quartertone. Equal temperaments tempering out 1728/1715 and hence containing orwell tetrads include 22, 26, 27, 31, 53, 58, 80, 84, 111 and 137.
The orwell tetrad can in a natural way be extended to the 11-limit as 1–7/6–11/8–8/5 by tempering out 99/98, a comma of 11-limit orwell. With a bit more accuracy, tempering out 176/175 and so also 540/539 allows it to be seen as the guanyin tetrad, a tempered version of 1–7/6–15/11–8/5. Equal temperaments with guanyin tetrads include 22, 31, 53, 58, 80 and 111. In orwell temperament, where 121/120 is tempered out, the guanyin and orwell tetrads are the same.
The tetrad can be extended to a 15-odd-limit ennead, the orwell-tempered version of
1–11/10–7/6–9/7–11/8–3/2–8/5–7/4–15/8, with steps of size 11/10, 15/14, 11/10, 15/14, 11/10, 15/14, 11/10, 15/14, 15/14.
The orwell ennead is the same as the Orwell[9] mos, considered as a chord. Since it can be considered to be a chord, it is possible to retune music from 12edo to Orwell[9] by using the orwell9-12 scale. Examples of music retuned in this way are given below: