7Preludes in Quarter-Tone System: XVII
8Preludes in Quarter-Tone System: XVIII
9Preludes in Quarter-Tone System: XX
10Preludes in Quarter-Tone System: XXI
11Preludes in Quarter-Tone System: XXIII
12Preludes in Quarter-Tone System: XXIV
13Three Quarter-Tone Pieces for Two Pianos: Largo
14Three Quarter-Tone Pieces for Two Pianos: Allegro
15Three Quarter-Tone Pieces for Two Pianos: Chorale
1617Étude sur le 'Carré Magique Sonore', Op. 40
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