ELI5, movies were made with photos that played very quickly, but how was sound added to that when it did?
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The soundtrack had, until films were replaced with digital files, its own place inside the film. Near the pictures there was a small line dedicated to the sound and to the music, in modern films it included even more than one track. Take a look [here](http://www.cineteatrolentate.it/files/audio.jpg).
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