Side 1 of Switched on Bach on IA: https://archive.org/details/SwitchedOnBach2

Side 2: https://archive.org/details/SwitchedOnBach1

I also (weirdly?) found them hosted on the site of the Computer History Museum:

Side 1 https://archive.computerhistory.org/resources/access/sound-r...

Side 2 https://archive.computerhistory.org/resources/access/sound-r...

An incredible masterpiece.