As professor of music theory at the Cologne Musikhochschule, Hermann Schroeder (1904-1984) composed many instrumental works for his colleagues, including 4 Imprompus for solo flute (1975).
The impromtus are ideal as an introduction to the freely tonal style of 20th-century moderate modernism, e. g. in preparation for the music by Hindemith, Genzmer, Jolivet, or Roussel. The pieces deal with musical themes such as cantabile playing, free interpretation without time pattern, differentiated rhythm, extended tonality, major intervals, dexterity, and much more. The musically appealing little pieces each have a different character and tempo and are suitable performance pieces. Also published: Sonate für Querflöte und Orgel (Schott ED 8386).