Two FFGL plugins, a source and an effect that draws over your clip, that doodle the music into the air: rings of sound on the kick, impact stars on the snare, zigzag bolts on the big hits, curls off the hi-hats, and one long wobbly line that's the spectrum. Every doodle is drawn again for every drawing, 24, 12 or 8 times a second, by a hand that can't hold still, so every line boils the way hand-drawn animation does. It listens to Resolume's audio input, and follows the beat when there's nothing to hear.
This demo runs the plugin's shaders and a port of its CPU half in your browser, so it needs JavaScript and WebGL2. The plugin itself, its source and its downloads are on its repository.