The spectrum laid down as a sheared waterfall, one line per frame receding into the past, so a track's whole structure is visible at once as terrain — the display every spectrogram wants to be, with the ridges of sustained notes running back toward the horizon.
Drawn with: a WebGL2 shader.
Reacts to and looks like: gpu, webgl2 and audio-reactive.
Family: Visualiser.
Runs in your browser. The preview above is the same program the renderer uses.