Auroratone was a "process for translating music into color" invented circa 1940 by Englishman Cecil Stokes. The music vibrated an emulsion of crystallizing chemicals, and this was then photographed by a color movie camera, producing a kind of psychedelic movie of shifting colors synchronized with music (but this was the 1940s, before the concept of psychedelics was known in popular culture).
The hope was that these auroratone films could be used to treat psychiatric patients, and they were experimentally shown to soldiers in an army hospital suffering from psychotic depressions. Conclusion: "Observation revealed that these patients were intensely absorbed in the films, that their span of attention to the films was appreciably lengthened after exposure to the films. Weeping and sobbing was observed in some patients. Many patients became more accessible to individual and group psychotherapy immediately folllowing exposure to these films."
Their effect was also tested on juvenile delinquents. One kid told the experimenter, "I think God must have painted those pictures."
A company was formed to commercialize Auroratones and guide their development. Investors in this company included the Crosby Brothers (Larry and his famous brother Bing). Bing sang the music for many of the auroratones.
Treating psychiatric patients wasn't very profitable, so there was hope to find more lucrative applications of the auroratone process. One idea was to transfer auroratone color patterns onto textiles and ceramics. Some silk scarfs printed with visualizations of Bing Crosby singing "Home on the Range" were apparently manufactured, but never sold.
Not many auroratones still survive, but an example of one can be viewed on YouTube:
The auroratone process reminds me of the Clavilux (or Color Organ) invented by Thomas Wilfred in 1919 (previously posted about here
More info about auroratones: Wikipedia
and Milwaukee Journal, Dec 6, 1948
Also see: Rubin, HE & Katz, E. (Oct 1946). "Auroratone films for the treatment of psychotic depressions in an army general hospital," Journal of Clinical Psychology
, 2(4): 333-340.