Discovering Electronic Music (1983)
This 1983 film “Discovering Electronic Music” directed by Bernard Wilets, is an introduction to the synthesizers and computers used to create electronic music. The film explains the basics of how sound is converted into electrical signals, the functions of oscillators, envelopes and filters, and the roles of samplers and sequencers. This is an “open source” movie published in Archive.org
Sound on Film (1943)
This public domain film explains the mysteries of sound recording on film.
The Nature of Sound (1948)
In this public domain film from the Prelinger Archives collection, a boy uses his radio equipment to demonstrate how sound is produced and transmitted. The film was produced by Coronet Instructional Films.
Sound and The Story
This RCA Victor film explains the process of cutting a long play record album.
Tacoma Narrows Bridge Collapse (1940)
Example of resonance in physical structures.