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80edo: Difference between revisions

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== Theory ==
== Theory ==
80edo is the first edo that represents the [[19-odd-limit]] [[tonality diamond]] [[consistent]]ly, though it barely manages to do so. Despite this, a large number of intervals in higher odd limits are consistent, and its [[patent val]] generally does well at approximating the [[29-limit|29-prime-limited]] [[harmonic series]] segments, such as modes 16 through 30 but especially modes 8 through 15. It achieves this much consistency with all primes in the 29-limit except 13 being sharp of just; the inconsistencies usually arise through not cancelling the over-sharpness of compound harmonics [[21/1|21]], [[27/1|27]], [[35/1|35]], [[45/1|45]], [[49/1|49]], and their octave-equivalents, which may be seen as an interesting limitation. This means it can be used as a general-purpose approximate 29-limit system with a relatively manageable number of tones, with some care taken around inconsistency. In fact, it is almost consistent to the no-21 no-27 [[29-odd-limit]], with the exception of [[25/13]] and its octave complement. Possible additions to this include [[33/1|33]], [[37/1|37]], [[39/1|39]], and [[41/1|41]]. Thus, it can also model larger primes if one is willing to accept their sharpness, and for this purpose, it does well for its size at the no-31's [[41-limit]], or even the [[43-limit]] if you are fine with [[43/32]] being slightly flat causing more inconsistencies.  
80edo is the first edo that represents the [[19-odd-limit]] [[tonality diamond]] [[consistent]]ly, though it barely manages to do so. Despite this, a large number of intervals in higher odd limits are consistent, and its [[patent val]] generally does well at approximating the [[29-limit|29-prime-limited]] [[harmonic series]] segments, such as modes 16 through 30 but especially modes 8 through 15. It achieves this much consistency with all primes in the 29-limit except 13 being sharp of just; the inconsistencies usually arise through not cancelling the over-sharpness of compound harmonics [[21/1|21]], [[27/1|27]], [[35/1|35]], [[45/1|45]], [[49/1|49]], and their octave-equivalents, which may be seen as an interesting limitation. This means it can be used as a general-purpose approximate 29-limit system with a relatively manageable number of tones, with some care taken around inconsistency. In fact, it is almost consistent to the no-21 no-27 [[29-odd-limit]], with the exception of [[25/13]] and its octave complement, meaning it makes a surprisingly reasonable [[25-odd-limit]] system, with only [[26/21]], [[21/17]], [[21/16]] and their [[octave complement]]s as extra inconsistencies, which a theorist might find various justifications for. Possible additions to this include [[33/1|33]], [[37/1|37]], [[39/1|39]], and [[41/1|41]]. Thus, it can also model larger primes if one is willing to accept their sharpness, and for this purpose, it does well for its size at the no-31's [[41-limit]], or even the [[43-limit]] if you are fine with [[43/32]] being slightly flat causing more inconsistencies.


If one wants higher precision as one goes to higher primes to try to convey the subtle harmonic qualities of those primes, 80et arguably fails in general, although many specific cases may be convincing. A promising alternative is using 80et as a model in which to fit higher-limit JI by way of approximating as much of the harmonic series as possible, for which it can model the 125-odd-limit quite well (corresponding to the 113-prime-limit), leading to an excellent [[Ringer scale]] described in the [[#Ringer 80|Ringer 80 section of this article]].
If one wants higher precision as one goes to higher primes to try to convey the subtle harmonic qualities of those primes, 80et arguably fails in general, although many specific cases may be convincing. A promising alternative is using 80et as a model in which to fit higher-limit JI by way of approximating as much of the harmonic series as possible, for which it can model the 125-odd-limit quite well (corresponding to the 113-prime-limit), leading to an excellent [[Ringer scale]] described in the [[#Ringer 80|Ringer 80 section of this article]].
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| 24
| 24
| 360
| 360
| [[16/13]]
| [[16/13]], ''[[26/21]]''
|-
|-
| 25
| 25
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| …
| …
|}
|}
<nowiki>*</nowiki> {{sg|no-31's [[37-limit]]}} Inconsistent interpretations in ''italic''.
<nowiki>*</nowiki> {{sg|80edo|limit=no-31's [[37-limit]]}} Inconsistent interpretations in ''italic''.


== Notation ==
== Notation ==
=== Ups and downs ===
80edo can be notated using [[Kite's ups and downs notation]]. Note that quudsharp (quadruple-down sharp) is equivalent to quip (quintuple-up) and that quupflat (quadruple-up flat) is equivalent to quid (quintuple-down):
{{Ups and downs sharpness}}
=== Sagittal ===
Notating 80edo in Sagittal (with diatonic whole tone equal to 14 edosteps, diatonic semitone equal to 5 edosteps):
Notating 80edo in Sagittal (with diatonic whole tone equal to 14 edosteps, diatonic semitone equal to 5 edosteps):
{| class="wikitable" style="text-align: center;"
{| class="wikitable" style="text-align: center;"
|-
|-
! Degree
! Degree
! −9
| '''−9'''
! −8
| −8
! −7
| −7
! −6
| −6
! −5
| −5
! −4
| −4
! −3
| −3
! −2
| −2
! −1
| −1
! 0
| '''0'''
! +1
| +1
! +2
| +2
! +3
| +3
! +4
| +4
! +5
| +5
! +6
| +6
! +7
| +7
! +8
| +8
! +9
| '''+9'''
|-
|-
! Evo
! Evo
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| [[Srutal archagall]]
| [[Srutal archagall]]
| [[Bidia]]
| [[Bidia]]
| [[Pentorwell]]
| [[Pentaorwell]]
| 80 & 104
| 80 & 104
| [[Linus]] retraction
| [[Linus]] retraction
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| 44.9%
| 44.9%
| Normal
| Normal
| [[Supermajor]]
| [[Supermajor (temperament)|Supermajor]]
| [[Echidna]], [[semisupermajor]]
| [[Echidna]], [[semisupermajor]]
| ?
| ?
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| 36/35~40/39
| 36/35~40/39
| [[Quartonic]]
| [[Quartonic]]
|-
| 1
| 7\80
| 105
| 17/16
| [[Lucite]]
|-
|-
| 1
| 1
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| 435
| 435
| 9/7
| 9/7
| [[Supermajor]]
| [[Supermajor (temperament)|Supermajor]]
|-
|-
| 1
| 1
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| 495
| 495
| 4/3
| 4/3
| [[Leapfrog]]
| [[Leapmonth]]
|-
|-
| 1
| 1
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| 225<br>(15)
| 225<br>(15)
| 8/7<br>(64/63)
| 8/7<br>(64/63)
| [[Pentorwell]]
| [[Pentaorwell]]
|-
|-
| 5
| 5
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| [[Degrees]]
| [[Degrees]]
|}
|}
<nowiki/>* [[Normal forms|Octave-reduced form]], reduced to the first half-octave, and [[normal forms|minimal form]] in parentheses if distinct
<nowiki/>* [[Normal forms #Equave-reduced-generator form|Octave-reduced form]], reduced to the first half-octave, and [[normal forms #Minimal-generator form|minimal form]] in parentheses if distinct


== Detemperaments ==
== Detemperaments ==
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* [[Equipentatonic]] (exactly [[5edo]]): 16 16 16 16 16
* [[Equipentatonic]] (exactly [[5edo]]): 16 16 16 16 16
* [[Equiheptatonic]] (approximate): 11 12 11 12 11 12 11
* [[Equiheptatonic]] (approximate): 11 12 11 12 11 12 11
* [[Maeve Gutierrez|Gutierrez Moonglade scale]]


== Music ==
== Music ==
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; [[Xotla]]
; [[Xotla]]
* "Mollusc Merchant" from ''Jazzbeetle'' (2023) [https://xotla.bandcamp.com/track/mollusc-merchant-80edo Bandcamp] | [https://www.youtube.com/watch?v=5cb0WHAwVuM YouTube]
* "Mollusc Merchant" from ''Jazzbeetle'' (2023) [https://xotla.bandcamp.com/track/mollusc-merchant-80edo Bandcamp] | [https://www.youtube.com/watch?v=5cb0WHAwVuM Original YouTube video] [https://www.youtube.com/watch?v=LnWJzffO7dY YouTube video without AI visuals] (2025)


==Instruments==
==Instruments==
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