Fluid just intonation

Fluid just intonation^{[idiosyncratic term]} 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).

Sheldon described fluid just intonation in the piece’s description:

“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.”

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.