With around two hundred pieces and a total duration of four and a half hours, Georg Kröll's diary is one of the largest piano cycles in music history. And the work in progress, which began in 1987, continues to grow. All the pieces that have already been composed and those that are still possible are based on the basic series of Arnold Schönberg's Suite for Piano op. 25. Schönberg's series is permuted 42 times. Each tone of this permutation, 42 x 12 = 504 tones, becomes the basic and starting tone in the sense of a code that generates the material of the piece in question. Right at the beginning in 1987, for example, Kröll wrote the piece Parodia ad A. Sch. on the basis of the starting tone 82 in reference to the prelude of Schönberg's Suite. Just as this first purely dodecaphonic work, composed between 1921 and 1923, combines the new pitch organization with old movement types from the French suite, Kröll combines innovation and tradition in Tagebuch through numerous references to music from the past and present.
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