Dutch opera composers

Hans Henkemans (The Hague, 23 December 1913 – Nieuwegein, 29 December 1995) was a Dutch pianist, teacher, composer of classical music and psychiatrist.
Henkemans was one of the most important Dutch composers of his time. From 1926 to 1931 he studied piano and composition with Bernhard van den Sigtenhorst Meyer, and from 1933 to 1938 with Willem Pijper. Later he studied piano with George van Renesse. Henkemans was influenced by Claude Debussy, Maurice Ravel and Willem Pijper.

Antonius Wilhelmus Adrianus de Leeuw (Rotterdam, 16 November 1926 - Paris, 31 May 1996) was a Dutch composer. He occasionally experimented with microtonality.