Chrome Music lab has a way to paint music like Kandinsky and actually hear what it sounds like, as well as a handful of other creative music creation and visualization tools. Check it out! It’s great for people ages 3 through 106.
https://musiclab.chromeexperiments.com/
Here’s a song I made:
https://musiclab.chromeexperiments.com/Song-Maker/song/6440662331293696