György Ligeti
György Ligeti (1923-2006) has been called "one of the most important avant-garde composers in the latter half of the twentieth century".
Ligeti composed over 80 concert works. Several of them employed microtonal techniques in small or large ways. Let us document them here.
In symphonic music
Two sections tuned a quarter-tone apart
Works for harpsichord in meantone
Chaconne, I believe.
Use of 7th partial for horn
In Six Bagatelles.