||Sonata in F minor
||Sonate for klaver
The fact that the Sonata in F minor and the Sonatina in E major are handed down as dyeline prints, copyrighted in 1944, indicates that Klenau originally planned to have them published, but for unknown reasons this never happened. Both sonatas are based on the dodecaphonic technique, which in those days was highly controversial in Danish musical circles, but which the composer considered an important increase in and enrichment of the musical means of expression. According to Klenau, 12-note serial composition did not indicate a break away from the theory of harmony based on major/minor tonality, and it was important for him to show that it was possible to compose 12-note serial music worth listening to.
The Sonata in F minor, which like the Sonatina in E major is an example of his so-called "12-note serial composition in a fixed key", is in four movements.