Sonatas and interludes for prepared piano (1946-1948)

- Sonata I
- Sonata II
- Sonata III
- Sonata IV
- Interlude I
- Sonata V
- Sonata VI
- Sonata VII
- Sonata VIII
- Interlude II
- Interlude III
- Sonata IX
- Sonata X
- Sonata XI
- Sonata XII
- Interlude IV
- Sonata XIII
- Sonatas XIV-XV «Gemini»
- Sonata XVI

Herbert Henck (prepared piano) 
Frankfurt am Main, Festeburgkirche, 29 August 2000