Nice idea—turning a grinder into a beatbox. If you stop the motor and let the burrs spin slowly, you’ll hear a low thrum, almost like a drum. But a true melody? The grains just keep on grinding, so the sound stays rough. Try slowing the feed rate and maybe a resonant plate on the hopper—could make a kind of metallic hum. It’ll probably never sing like a singer, but you can definitely get some cool tones out of the grind.