One of my favorite things along these lines is this 1951 video of Les Paul explaining how he uses multitrack recording to produce his records. The first part of the video is great, mocking the idea of some sort of computer that generates the music itself.
It's pretty unbelievable to think that this was almost considered voodoo at the time, yet now ANY recording is done in this way. Thanks for the link. Very cool as well.
https://www.youtube.com/watch?v=rITJyZVTfy4