For his son's fourth birthday in 1919 he wrote Toys for soprano and piano, his first composition in his atonal, contrapuntal style.
Oma poja neljandaks sünnipäevaks 1919. aastal kirjutas ta teose "Toys" sopranile ja klaverile; see oli esimene teos, mille ta kirjutas atonaalses, kontrapunktilises stiilis.