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Heugel
Revised on several occasions from 1956 to 2012. Chapter 4 was not included at the time of the composer’s death.
Chapter 6 may have been composed in 1959, which may also be a date of “completion” for a work which has continually evolved and has remained incomplete in a sense while being playable as it has existed.
Bösche 1995; Jameux 1991; Piencikowski 1998