During this time, he taught composition privately, was active in the ISCM, participated in Hermann Scherchen’s ‘Sessions d’études musicales et dramatiques’ in Strasbourg, and organized the International Twelve-Tone Music pre-conference in Osilina in 1949.
Under denna tid studerade han komposition privat, var aktiv i ISCM, deltog i Hermann Scherchens "Sessions d'études musicales et dramatiques" i Strasbourg, och organiserade en internationell pre-konferens för tolvtonsmusik i Osilina 1949.