Fluid just intonation: Difference between revisions

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{{todo|inline=1|research|text=It is unclear whether “fluid just intonation” is synonymous with “adaptive just intonation”, or whether it is more specific. Take this page with a grain of salt until that has been clarified.
'''Fluid just intonation'''{{idiosyncratic}} is a subtype of [[adaptive just intonation]] developed by composer and music theorist [[Rosie Sheldon]] in 2021.
 
If any wiki users can provide more specific or detailed information about fluid just intonation, please add it to this page.}}
 
'''Fluid just intonation'''{{idiosyncratic}} is a type of [[adaptive just intonation]] developed by composer and music theorist [[Rosie Sheldon]] in 2021.


She first used it in her piece ''Microtonal Composition in "Fluid Just Intonation"'' (composed 2021, published 2022):
She first used it in her piece ''Microtonal Composition in "Fluid Just Intonation"'' (composed 2021, published 2022):
* [https://www.youtube.com/watch?v=IKjNIBEGtVc listen on YouTube]
* [https://www.youtube.com/watch?v=IKjNIBEGtVc listen on YouTube]
* [https://rosiesheldon.bandcamp.com/track/microtonal-composition-in-fluid-just-intonation listen on Bandcamp]
* [https://rosiesheldon.bandcamp.com/track/microtonal-composition-in-fluid-just-intonation listen on Bandcamp]
* [https://www.sheetmusicdirect.com/en-US/se/ID_No/1382604/Product.aspx purchase sheet music] (includes instructions for configuring a {{w|DAW}} for this tuning method)
== Description ==
Notes are tuned on a chord-by-chord basis.
Each chord contains a ''common note'' shared wuth the previous chord. The tuning of the common note stays exactly the same, and all other notes of the new chord are tuned in pure [[JI]] ratios relative to the common note.
The allowed ratios, and how much they differ from their [[12edo]] tempered version, are listed in the following table:
{| class="wikitable"
! Scale Degree!! Ratio!!Tuning adjustment in cents^
|-
|1||1/1||-
|-
|b2||16/15||5
|-
|2||9/8||4
|-
|b3||6/5||16
|-
|3||5/4||-14
|-
|4||4/3||-2 (subdominant)
|-
|#4/b5||11/8||-49
|-
|5||3/2||2
|-
|b6||8/5||41
|-
|6||5/3||6
|-
| rowspan="2" |b7||7/4 (dom7)||-31 (dom7)
|-
|9/5 (m7)||+18 (m7)
|-
|7||15/8||-12
|-
|8ve||2/1||-
|}
== Subsets and supersets ==
Fluid just intonation is a subset of [[11-limit]] just intonation.


Sheldon described fluid just intonation in the piece’s description:
It is also a subset of the [[polymicrotonal]] tuning of ([[15afdo]] and [[8afdo]]).
<pre>“This piece uses the concept of individually tuning each chord to Just Intonation, but relative to a note from the last chord, creating a fluid Just Intonation that is free from the base of Equal Temperament. This idea is similar to the way that professional choirs intonate with each other and the resulting pitch drifts, but instead in the context of electronic music.”</pre>


== Influences ==
Sheldon cited [[Adam Neely]]’s version of [[intonalism]] as the main inspiration behind the concept, with fluid just intonation being like Neely’s style of intonalism, but with the [[12edo]] skeleton removed and replaced with pure [[JI]].
Sheldon cited [[Adam Neely]]’s version of [[intonalism]] as the main inspiration behind the concept, with fluid just intonation being like Neely’s style of intonalism, but with the [[12edo]] skeleton removed and replaced with pure [[JI]].


Revision as of 03:24, 27 March 2025

Fluid just intonation[idiosyncratic term] is a subtype of adaptive just intonation developed by composer and music theorist Rosie Sheldon in 2021.

She first used it in her piece Microtonal Composition in "Fluid Just Intonation" (composed 2021, published 2022):

Description

Notes are tuned on a chord-by-chord basis.

Each chord contains a common note shared wuth the previous chord. The tuning of the common note stays exactly the same, and all other notes of the new chord are tuned in pure JI ratios relative to the common note.

The allowed ratios, and how much they differ from their 12edo tempered version, are listed in the following table:

Scale Degree Ratio Tuning adjustment in cents^
1 1/1 -
b2 16/15 5
2 9/8 4
b3 6/5 16
3 5/4 -14
4 4/3 -2 (subdominant)
#4/b5 11/8 -49
5 3/2 2
b6 8/5 41
6 5/3 6
b7 7/4 (dom7) -31 (dom7)
9/5 (m7) +18 (m7)
7 15/8 -12
8ve 2/1 -

Subsets and supersets

Fluid just intonation is a subset of 11-limit just intonation.

It is also a subset of the polymicrotonal tuning of (15afdo and 8afdo).

Influences

Sheldon cited Adam Neely’s version of intonalism as the main inspiration behind the concept, with fluid just intonation being like Neely’s style of intonalism, but with the 12edo skeleton removed and replaced with pure JI.

Sheldon also cited Jacob Collier, David Bruce, Dolores Catherino and Sevish as inspirations for the concept of fluid just intonation.

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