L4MPLIGHT
L4MPLIGHT, also known as LAMPLIGHT or ランプライト, is a Japanese composer, music theorist, conlanger and worldbuilder.
They developed the Shasavic, Faentian, and Lisatopian constructed languages, and Shasavistic music theory.
Shashavistic music theory
They describe Shasavistic music theory in their YouTube playlist titled 微分音理論 / Microtonal theory. It is recorded and illustrated in Shashavic with optional English and Japanese closed captions.
Original music
Their xenharmonic compositions are listenable in their YouTube playlist titled 微分音作品 / Microtonal works.