24 preludes in quarter-tone system (1934/70) (excerpts): i.
Op.22 - Prelude №1 en quarts de ton (1970)
24 preludes in quarter-tone system v.
Op.45a Etude sur les Mouvements rotatoires (1961)
24 préludes, Opus 22 (1934) (1-6)
24 Preludes in Quarter-Tone System - I
