35edo: Difference between revisions
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== Theory == | == Theory == | ||
As 35 is 5 times 7, 35edo allows for mixing the two smallest xenharmonic [[macrotonal edos]]: [[5edo]] and [[7edo]]. A single degree of 35edo represents the difference between 7edo's narrow fifth of 685.71{{ | As 35 is 5 times 7, 35edo allows for mixing the two smallest xenharmonic [[macrotonal edos]]: [[5edo]] and [[7edo]]. A single degree of 35edo represents the difference between 7edo's narrow fifth of 685.71{{Cent}} and 5edo's wide fifth of 720{{C}}. Since it has two approximations of the perfect fifth which are close to equally off, 35edo is a classic example of a [[dual-fifth]] system. Because it includes 7edo, 35edo tunes the 29th harmonic with only 1{{C}} of error. | ||
35edo can also represent the 2.3.5.7.11.17 [[subgroup]] and 2.9.5.7.11.17 subgroup, because of the accuracy of 9 and the flatness of | 35edo can also represent the 2.3.5.7.11.17 [[subgroup]] and 2.9.5.7.11.17 subgroup, because of the accuracy of 9 and the flatness of the higher primes ([[7/5]] and [[17/11]] stand out, having less than 1 cent error). Therefore among [[whitewood]] tunings it is very versatile; you can switch between these different subgroups if you don't mind having to use two different 3/2s to reach the inconsistent 9 (a characteristic of whitewood tunings). | ||
35edo has the optimal [[patent val]] for [[greenwood]] and [[secund]] temperaments, as well as 11-limit [[muggles]], and the 35f val is an excellent tuning for 13-limit muggles. 35edo is the largest edo with a lack of a [[diatonic scale]] (unless 7edo is considered a diatonic scale). | 35edo has the optimal [[patent val]] for [[greenwood]] and [[secund]] temperaments, as well as 11-limit [[muggles]], and the 35f val is an excellent tuning for 13-limit muggles. 35edo is the largest edo with a lack of a [[diatonic scale]] (unless 7edo is considered a diatonic scale). | ||
| Line 11: | Line 11: | ||
=== Odd harmonics === | === Odd harmonics === | ||
{{Harmonics in equal|35}} | {{Harmonics in equal|35}} | ||
=== Dual-fifth harmony === | |||
35edo has two viable mappings of the [[3/2|perfect fifth]], one at 20\35 (4\7), and one at 21\35 (3\5). If one wishes to build a chord with the perfect fifth, one must decide which mapping to use. For example, if one wishes to use the classical major triad [[4:5:6]], then we find that 35edo's best approximation of [[5/4]] is just over 1/4 of a step flat, meaning that the flat mapping of 3/2 should be used in order for [[6/5]] to be tuned accurately. Thus the best approximation of 4:5:6 is 0–11–20 steps (0–377–686{{C}}), and the best approximation of its inverse [[10:12:15|1/(6:5:4)]], the classical minor triad, is 0–9–20 steps (0–309–686{{C}}). Here, the [[5/4]] and [[6/5]] intervals are tuned fairly accurately, being about 7–9{{C}} flat each, while [[3/2]] is more damaged at about 16{{C}} flat of just. However, since 3/2 is a very simple interval, it is recognizable even if heavily detuned. | |||
Amazingly, almost the exact same situation occurs with [[7/4]], for which 35edo's best approximation is also just over 1/4 of a step flat (resulting in a very accurate [[7/5]]). If we wish to use the [[4:6:7]] chord, then just like with 4:5:6, it is best to use the flat mapping of 3/2, resulting in a triad of 0–20–28 steps (0–686–960{{C}}). Its inverse, the [[14:21:24|1/(12:8:7)]] chord, is best mapped to 0–20–27 steps (0–686–926{{C}}). Here the damage is split between [[7/4]] and [[12/7]], with both being around 7–9{{C}} flat of just, which is almost the exact same situation as with 5/4 and 6/5. From here, we see that the best approximation of the harmonic seventh chord [[4:5:6:7]] is 0–11–20–28 steps (0–377–686–960{{C}}), while the best approximation of the subharmonic sixth chord [[70:84:105:120|1/(12:10:8:7)]] is 0–9–20–27 steps (0–309–686–926{{C}}). | |||
Overall, we find that 35edo's [[patent val]] is surprisingly accurate overall for the [[7-odd-limit]], with 3/2 being the only interval with high damage. However, this mapping does not work well in the [[9-odd-limit]], as [[9/8]] is tuned over 32{{C}} flat of just at 171{{C}}, and thus other intervals of 9 also become very inaccurate. Instead, 35edo has an accurate approximation of 9/8 at 6\35 (206{{C}}), but to reach it, we must stack one 20\35 fifth and one 21\35 fifth. The 21\35 fifth is the [[5edo]] fifth of 720{{C}}, being around 18{{C}} sharp of just. There are two mappings of the perfect fifth, with some chords preferring the flat fifth, while other chords prefer the sharp fifth. | |||
For example, suppose we want to use the [[6:7:9]] subminor triad. Then the closest approximation of [[7/6]] is 8 steps, and the closest approximation of [[9/7]] is 13 steps. Stacking these approximations gives the triad 0–8–21 steps (0–274–720{{C}}). Here, we use the sharp fifth instead of the flat one, so that [[7/6]] and [[9/7]] are tuned more accurately, being around 7{{C}} and 11{{C}} sharp of just respectively. The best approximation of the supermajor triad [[14:18:21|1/(9:7:6)]] is 0–13–21 steps (0–446–720{{C}}), which also uses the sharp fifth. A similar situation occurs with [[6:9:10]] and its inverse [[10:15:18|1/(9:6:5)]], where the best approximations of [[5/3]] and [[9/5]] are 26\35 and 30\35 respectively, so that the best approximations of 6:9:10 and 1/(9:6:5) are 0–21–26 steps (0–720–891{{C}}) and 0–21–30 steps (0–720–1029{{C}}) respectively, with 5/3 and 9/5 being around 7{{C}} and 11{{C}} sharp respectively. This leads to an approximation of the [[6:7:9:10]] harmonic sixth chord (sometimes known as the ''subminor tetrad'') at 0–8–21–26 steps (0–274–720–891{{C}}), and an approximation of the [[70:90:105:126|1/(9:7:6:5)]] subharmonic seventh chord (sometimes called the ''supermajor tetrad'') at 0–13–21–30 steps (0–446–720–1029{{C}}). | |||
The best approximation of the harmonic ninth chord [[4:5:6:7:9]] is 0–11–20–28–41 steps (0–377–686–960–1406{{C}}). Here, both mappings of 3/2 are used simultaneously, with the flat mapping occuring at 4:6, and the sharp mapping occuring at 6:9. The mapping of any chord in 35edo that is a subset of the 9-odd-limit otonal or utonal pentad (up to octave equivalence) can be taken as a subset of the mapping of 4:5:6:7:9, or the mapping of its inverse [[140:180:210:252:315|1/(9:7:6:5:4)]], that being 0–13–21–30–41 steps (0–446–720–1029–1406{{C}}), where any interval more complex than the perfect fifth is no more than 11{{C}} out of tune. | |||
Additionally, many triads are tuned very close to [[delta-rational]] tunings, which may make them sound less out of tune as well. For examples, the approximations of the triads [[4:5:6]], [[10:12:15|1/(6:5:4)]], [[6:7:9]], and [[14:18:21|1/(9:7:6)]] are very close to DR tunings. Voicings of chords that divide the fourth, those being [[6:7:8]], [[21:24:28|1/(8:7:6)]], [[9:10:12]], and [[15:18:20|1/(12:10:9)]], are also tuned fairly close to DR. | |||
==== Caveats of dual-fifth ==== | |||
However, using two mappings of the perfect fifth presents several problems. For example, in JI, there are the [[10:12:15:18]] and [[12:14:18:21]] chords and their inversions, known as [[anomalous saturated suspension]]s, which are dyadically consonant in the 9-odd-limit, even though they are not a subset of the 9-odd-limit otonal or utonal pentad. Their dyadic consonance relies on the compositeness of the number 9 as 3 × 3, and here the mapping breaks down when we try to use two different mappings of harmonic 3. For example, if we try to map the 10:12:15:18 chord with steps 6/5–5/4–6/5–10/9 (closing at the octave) in 35edo, then the 10:12:15 part suggests mapping the fifth above the root at 20\35, while the 10:15:18 part suggests mapping it to 21\35. As such, one of the 6/5–5/4–6/5–10/9 steps must be mapped to its second-best approximation, close to 3/4 of a 35edo step (about 25 cents) off of just. A similar issue occurs with 12:14:18:21, where one of the 7/6–9/7–7/6–8/7 steps must be mapped to its second-best approximation. Many other chords, such as [[8:10:12:15]], also cannot be mapped without a step being close to 3/4 of a 35edo step off. | |||
Additionally, many structures present in systems with a single fifth do not work well in 35edo. For example, the perfect fifth generates several [[mos scale]], such as the traditional [[diatonic]] scale. The diatonic mos scale does not exist in 35edo, with the 20\35 whitewood fifth generating an [[equalized]] version of the scale, while the 21\35 fifth generates a [[collapsed]] version of the scale. Since 35edo does not have a diatonic scale, [[chain-of-fifths notation]] also does not work in 35edo. However, there are scales such as 6 6 2 6 6 6 3 which sound similar to diatonic, and this particular scale can be obtained by alternately stacking 21\35 and 20\35 fifths, or [[Hobbled scale|hobbling]] a [[34edo]] or [[36edo]] diatonic scale. | |||
35edo is only one of many dual-fifth systems, with others including [[18edo]], [[23edo]], [[25edo]], [[28edo]], [[30edo]], [[37edo]], and [[40edo]], each with their own unique properties. | |||
=== Subsets and supersets === | |||
Since 35 factors as 5 × 7, its nontrivial subsets are [[5edo]] and [[7edo]]. Its double [[70edo]] corrects the perfect fifth, as well as the [[13/1|13th harmonic]], though the [[5/1|5th]] and [[7/1|7th]] harmonics become relatively inaccurate. The quadruple of 35edo, which is [[140edo]], additionally corrects the mappings of primes 5 and 7, and makes for an excellent [[17-limit]] system and beyond. | |||
== Intervals == | |||
(Bolded ratio indicates that the ratio is most accurately tuned by the given 35edo interval.) | |||
{| class="wikitable center-1 right-2" | |||
|- | |||
! # | |||
! Cents value | |||
! Ratios in the<br>2.5.7.11.17 subgroup | |||
! Ratios with<br>flat 3 | |||
! Ratios with<br>sharp 3 | |||
! Ratios with<br>best 9 | |||
|- | |||
| 0 | |||
| 0.000 | |||
| '''1/1''' | |||
| | |||
| | |||
| | |||
|- | |||
| 1 | |||
| 34.286 | |||
| '''50/49''', '''121/119''', 33/32 | |||
| '''36/35''' | |||
| 25/24 | |||
| '''64/63''', '''81/80''' | |||
|- | |||
| 2 | |||
| 68.571 | |||
| 128/125 | |||
| '''25/24''' | |||
| 81/80 | |||
| | |||
|- | |||
| 3 | |||
| 102.857 | |||
| '''17/16''' | |||
| '''15/14''' | |||
| '''16/15''' | |||
| '''18/17''' | |||
|- | |||
| 4 | |||
| 137.143 | |||
| | |||
| '''12/11''', 16/15 | |||
| | |||
| | |||
|- | |||
| 5 | |||
| 171.429 | |||
| '''11/10''' | |||
| | |||
| 12/11 | |||
| '''10/9''' | |||
|- | |||
| 6 | |||
| 205.714 | |||
| | |||
| | |||
| | |||
| '''9/8''' | |||
|- | |||
| 7 | |||
| 240.000 | |||
| '''8/7''' | |||
| | |||
| 7/6 | |||
| | |||
|- | |||
| 8 | |||
| 274.286 | |||
| '''20/17''' | |||
| '''7/6''' | |||
| | |||
| | |||
|- | |||
| 9 | |||
| 308.571 | |||
| | |||
| '''6/5''' | |||
| | |||
| | |||
|- | |||
| 10 | |||
| 342.857 | |||
| '''17/14''' | |||
| | |||
| 6/5 | |||
| '''11/9''' | |||
|- | |||
| 11 | |||
| 377.143 | |||
| '''5/4''' | |||
| | |||
| | |||
| | |||
|- | |||
| 12 | |||
| 411.429 | |||
| '''14/11''' | |||
| | |||
| | |||
| | |||
|- | |||
| 13 | |||
| 445.714 | |||
| '''22/17''', 32/25 | |||
| | |||
| | |||
| '''9/7''' | |||
|- | |||
| 14 | |||
| 480.000 | |||
| | |||
| | |||
| 4/3, '''21/16''' | |||
| | |||
|- | |||
| 15 | |||
| 514.286 | |||
| | |||
| '''4/3''' | |||
| | |||
| | |||
|- | |||
| 16 | |||
| 548.571 | |||
| '''11/8''' | |||
| | |||
| | |||
| | |||
|- | |||
| 17 | |||
| 582.857 | |||
| '''7/5''' | |||
| '''24/17''' | |||
| 17/12 | |||
| | |||
|- | |||
| 18 | |||
| 617.143 | |||
| '''10/7''' | |||
| '''17/12''' | |||
| 24/17 | |||
| | |||
|- | |||
| 19 | |||
| 651.429 | |||
| '''16/11''' | |||
| | |||
| | |||
| | |||
|- | |||
| 20 | |||
| 685.714 | |||
| | |||
| '''3/2''' | |||
| | |||
| | |||
|- | |||
| 21 | |||
| 720.000 | |||
| | |||
| | |||
| 3/2, '''32/21''' | |||
| | |||
|- | |||
| 22 | |||
| 754.286 | |||
| '''17/11''', 25/16 | |||
| | |||
| | |||
| '''14/9''' | |||
|- | |||
| 23 | |||
| 788.571 | |||
| '''11/7''' | |||
| | |||
| | |||
| | |||
|- | |||
| 24 | |||
| 822.857 | |||
| '''8/5''' | |||
| | |||
| | |||
| | |||
|- | |||
| 25 | |||
| 857.143 | |||
| '''28/17''' | |||
| | |||
| 5/3 | |||
| '''18/11''' | |||
|- | |||
| 26 | |||
| 891.429 | |||
| | |||
| '''5/3''' | |||
| | |||
| | |||
|- | |||
| 27 | |||
| 925.714 | |||
| '''17/10''' | |||
| '''12/7''' | |||
| | |||
| | |||
|- | |||
| 28 | |||
| 960.000 | |||
| '''7/4''' | |||
| | |||
| | |||
| | |||
|- | |||
| 29 | |||
| 994.286 | |||
| | |||
| | |||
| | |||
| '''16/9''' | |||
|- | |||
| 30 | |||
| 1028.571 | |||
| '''20/11''' | |||
| | |||
| | |||
| '''9/5''' | |||
|- | |||
| 31 | |||
| 1062.857 | |||
| | |||
| '''11/6''', 15/8 | |||
| | |||
| | |||
|- | |||
| 32 | |||
| 1097.143 | |||
| '''32/17''' | |||
| '''28/15''' | |||
| '''15/8''' | |||
| '''17/9''' | |||
|- | |||
| 33 | |||
| 1131.429 | |||
| | |||
| | |||
| | |||
| | |||
|- | |||
| 34 | |||
| 1165.714 | |||
| | |||
| | |||
| | |||
| | |||
|- | |||
| 35 | |||
| 1200.000 | |||
| 2/1 | |||
| | |||
| | |||
| | |||
|} | |||
== Notation == | == Notation == | ||
| Line 323: | Line 611: | ||
For a more complete list, see [[Ups and downs notation#Chords and Chord Progressions|Ups and downs notation - Chords and Chord Progressions]]. | For a more complete list, see [[Ups and downs notation#Chords and Chord Progressions|Ups and downs notation - Chords and Chord Progressions]]. | ||
== JI | == Approximation to JI == | ||
{{ | {{Q-odd-limit intervals|35}} | ||
== Regular temperament properties == | == Regular temperament properties == | ||
| Line 626: | Line 651: | ||
| 1 | | 1 | ||
| 6\35 | | 6\35 | ||
| colspan="2" | [[Baldy]] (messed-up) | | colspan="2" | [[Baldy]] (messed-up){{idiosyncratic}} | ||
| [[1L 4s]], [[5L 1s]], [[6L 5s]], [[6L 11s]], [[6L 17s]], [[6L 23s]] | | [[1L 4s]], [[5L 1s]], [[6L 5s]], [[6L 11s]], [[6L 17s]], [[6L 23s]] | ||
|- | |- | ||
| Line 632: | Line 657: | ||
| 8\35 | | 8\35 | ||
| | | | ||
| [[Orwell]] (messed-up) | | [[Orwell]] (messed-up){{idiosyncratic}} | ||
| [[1L 3s]], [[4L 1s]], [[4L 5s]], [[9L 4s]], [[13L 9s]] | | [[1L 3s]], [[4L 1s]], [[4L 5s]], [[9L 4s]], [[13L 9s]] | ||
|- | |- | ||
| Line 655: | Line 680: | ||
| 1 | | 1 | ||
| 13\35 | | 13\35 | ||
| colspan="2" | Inconsistent 2.9 | | colspan="2" | Inconsistent 2.5/3.9/7 [[sensi]]/[[subgroup_temperaments#Sentry|sentry]] | ||
| [[2L 1s]], [[3L 2s]], [[3L 5s]], [[8L 3s]], [[8L 11s]], [[8L 19s]] | | [[2L 1s]], [[3L 2s]], [[3L 5s]], [[8L 3s]], [[8L 11s]], [[8L 19s]] | ||
|- | |- | ||
| Line 826: | Line 851: | ||
* [[Blackwood|6/5-blackwood]][15]: 2 3 2 2 3 2 2 3 2 2 3 2 2 3 2 | * [[Blackwood|6/5-blackwood]][15]: 2 3 2 2 3 2 2 3 2 2 3 2 2 3 2 | ||
* [[Blackwood|6/5-blackwood]][20]: 2 2 1 2 2 2 1 2 2 2 1 2 2 2 1 2 2 2 1 2 | * [[Blackwood|6/5-blackwood]][20]: 2 2 1 2 2 2 1 2 2 2 1 2 2 2 1 2 2 2 1 2 | ||
* 2L 9s (4:3) [11]: 3 3 4 3 3 3 3 3 4 3 3 --- A scale doing great job tempering the 2.9.11.17 subgroup near JI. | |||
=== Ripple scales === | === Ripple scales === | ||
| Line 993: | Line 1,019: | ||
=== Modern renderings === | === Modern renderings === | ||
; {{W|Frederick Chopin}} | ; {{W|Frederick Chopin}} | ||
* [https://www.youtube.com/watch?v=1odAmqiQaz0 ''CHOPIN Waltz op 64 #2''] (1847 | * [https://www.youtube.com/watch?v=1odAmqiQaz0 ''CHOPIN Waltz op 64 #2''] (1847) – rendered in 35-edo with alternating sharp and flat fifths by [[Claudi Meneghin]] (2025) | ||
; {{W|Gesualdo}} | ; {{W|Carlo Gesualdo}} | ||
* [https:// | * [https://www.youtube.com/watch?v=idUG-x8kT3o&t=305 ''Dolcissima mia vita''] – in three comparative tunings including 35edo (5:05–10:05), rendered by [[Chris Vaisvil]] (2025) | ||
=== 21st century === | === 21st century === | ||
; [[Bryan Deister]] | |||
* [https://www.youtube.com/shorts/6X1-692axAk ''35edo''] (2025) | |||
* ''Whistling Like An Oberon - 35edo'' (2026) | |||
** [https://www.youtube.com/shorts/rTkr2YHDvZM <nowiki>[short 1]</nowiki>] | |||
** [https://www.youtube.com/shorts/AvIGI8TG9_8 <nowiki>[short 2]</nowiki>] | |||
** [https://m.youtube.com/watch?v=zPRYktfbJj8 <nowiki>[full piece]</nowiki>] | |||
* [https://www.youtube.com/watch?v=x8doWEgXMCY ''35edo improv''] (2026) | |||
; [[dotuXil]] | ; [[dotuXil]] | ||
| Line 1,005: | Line 1,038: | ||
; [[E8 Heterotic]] | ; [[E8 Heterotic]] | ||
* [https://youtu.be/07-wj6BaTOw ''G2 Manifold''] (2020) – uses a combination of 5edo and 7edo, which can be classified as a 35edo subset. | * [https://youtu.be/07-wj6BaTOw ''G2 Manifold''] (2020) – uses a combination of 5edo and 7edo, which can be classified as a 35edo subset. | ||
; [[Francium]] | |||
* "What Kind Of Things" from ''TOTMC 2025'' (2025) – [https://francium223.bandcamp.com/track/what-kind-of-things Bandcamp] | [https://www.youtube.com/watch?v=WaRm0dlUqQU YouTube] | |||
; [[groundfault]] | |||
* "Sakura Blade Minivan", from ''Souvenirs of the Affliction'' (2025) – [https://groundfco.bandcamp.com/track/sakura-blade-minivan-27-35edo-2 Bandcamp] | [https://www.youtube.com/watch?v=rrjuGmmodn0&t=1436 YouTube (23:56–27:58)] – in part, the rest being in 27edo | |||
; [[JUMBLE]] | ; [[JUMBLE]] | ||
| Line 1,010: | Line 1,049: | ||
; [[Budjarn Lambeth]] | ; [[Budjarn Lambeth]] | ||
* [https://www.youtube.com/watch?v=ZPXaMTdTSgw ''Lighting the Jack-o'-lanterns''] (2025, uses meta-monsoon scale{{idio}} from 6/5-[[ | * [https://www.youtube.com/watch?v=ZPXaMTdTSgw ''Lighting the Jack-o'-lanterns''] (2025, uses meta-monsoon scale{{idio}} from 6/5-[[Blackwood]][20]) | ||
; [[Chuckles McGee]] | ; [[Chuckles McGee]] | ||
* [https://www.archive.org/download/Transcendissonance/05Self-destructingMechanicalForest-CityOfTheAsleep.mp3 Self-Destructing Mechanical Forest] | * [https://www.archive.org/download/Transcendissonance/05Self-destructingMechanicalForest-CityOfTheAsleep.mp3 ''Self-Destructing Mechanical Forest''] – in Secund[9], 35edo tuning | ||
; [[Claudi Meneghin]] | ; [[Claudi Meneghin]] | ||
* [https://web.archive.org/web/20190412163316/http://soonlabel.com/xenharmonic/archives/2348'' Little Prelude & | * [https://web.archive.org/web/20190412163316/http://soonlabel.com/xenharmonic/archives/2348'' Little Prelude & Fugue, "The Bijingle"''] (2014) | ||
* [https://www.youtube.com/watch?v=JPie2YDwA8I ''MicroFugue on Happy Birthday for Baroque Ensemble''] (2023) | * [https://www.youtube.com/watch?v=JPie2YDwA8I ''MicroFugue on Happy Birthday for Baroque Ensemble''] (2023) | ||
* [https://www.youtube.com/shorts/c9rCrQwF1HI ''NEOBAROQUE CANON, 3-in-1 without Bass in 35-edo for Baroque Consort: Oboe, Recorder, Violin''] (2025) | |||
; [[No Clue Music]] | ; [[No Clue Music]] | ||