Oskar Wilhelm Fischinger was a German-American abstract animator, filmmaker, and painter, notable for creating abstract musical animation many decades before the appearance of computer graphics and music videos.
I know this because Google has done a Doodle:
I clicked on it and made my own which is this:
Amazing! I love it! It's really a 'riff'.
I will call it Flutterings ... after the pigeons in George Square last week.
Fischinger image Wikipedia.