Making a watercolor music visualizer in Blender

I did a little experiment in Blender a while ago and it turned out so well that I decided to make a tutorial on it.
But first of all, here is what I did:

Now of course this isn’t an entirely created inside of Blender (I’m not that good:spin:), instead I imported the individual lines as image sequences and keyframed the offset-value. If you want to find out more about this effect I made a full tutorial on it: