Hat sich Zdeněk Blažek in einem Irrtum befunden?
Was Zdeněk Blažek mistaken? A Few Notes on the Theoretical Concept of Double Alteration

Summary/Abstract: The paper is being understood as an answer to Jaroslav Smolka's negative opinion about Zdeněk Blažek's theory of the double alteration. (Sounding of two chromatic variants of the same degree of the diatonic scale: one note is altered with a fiat and the same note an octave higher or lower with the sharp at the same time). The author stands for Blažek's conception, which represents one of the most important contributions of Czech music theory to the European context ofharmonic thinking. In the conclusion, the author states an assumption that the double alteration led to new ideas of other Czech theorists, e.g. Jan Trojan, Jaroslav Volek, Arne Linka or Theodor Schaefer. These ideas about gradual chromatization of the diatonic scales led to the weakening of tonality at the end ofthe 19th century and to extended tonality or even atonality.

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