Don't know if these have been mentioned here. The Boston Symphony posted a
link to the first video today and I found the rest at the Internet archives
site.

 

The following are some films produced by RCA on how records are made, an
introduction to stereophonic sound, & Living stereo.

 

How records are made.including some footage of the BSO under Munch,
presumably recording Tchaikovsky's Romeo & Juliet.

 

https://archive.org/details/0530_Sound_and_the_Story_The_M03876_11_35_52_00

 

Must have been used as a demo for stereo at hifi shows. The end presumably
is meant to be synched with a stereo recording Grofe's Grand Canyon Suite.

 

https://archive.org/details/HowtoLis1957

 

An introduction to stereo & "Living stereo"

 

https://archive.org/details/LivingSt1958

 

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Eric Nagamine