Fascinating stuff. I teach motion graphics and the first assignment I give my students is to create an abstract animation that responds to a given piece of music.
I have long ago given up on requiring students to produce storyboards. I find them to be restrictive and unable to effectively address the transitions which are at the heart of a motion graphic. Instead I require them to produce single graphical ‘synestheticle representation’ of the music, and from that develop the animation. These graphics bear a strong similarity to the work shown in the O.P. I shall certainly be bookmarking it for their consumption.
The Music Animation Machine is a remarkable project that has been going strong (and improving!) for decades, and the entire homepage is delightfully geeky: http://www.musanim.com/all/
It has taken me ages to start appreciating the subject of Counterpoint. My older me would have seen this videos as a glorified, fantasy piano-roll view. Now I'm bookmarking, in the hope something in OP's site sticks. The full pic would have this horizontal view of the evolution of interwowen colored voices as complemented by the vertical view of functional harmony chords in a cadential ebb and flow.
Found this guy's YouTube channel when I was a kid learning to play the piano, googling my pieces to hear how they sounded. He introduced me to Bach, and I've loved him ever since :)
https://nrw-skulptur.net/skulptur/hommage-a-j-s-bach/