La Boîte à musique
Sack's work also extended to motion pictures, where he went largely uncredited. In 1939 he served as a violin double for Leslie Howard in David Selznick's picture, "Intermezzo". Beginning in 1944 he began working with Walt Disney Studios as an orchestrator and conductor on the films "The Three Caballeros", "Make Mine Music", and "Melody Time" — he received credit for the latter.