Within a dirty laboratory setting, Terra Muta[O] performs a giving of voice literally to the silent earth, to the already voiced crow (members of the Corvus family), and to the silent and darkened earth worm (Lumbricus terrestris). These two latter creatures give and take a material voice from the earth, and are implicated mythically and materially within cycles of decay, death, and rebirth (rewritten as Nigredo and Albedo). During a performance which unites deep earth currents and atmospheric signals with vocal beak and tongue fragility, both voice (material carrier for meaning or for nonsense), and the voiced (that non‐sense) are derived directly from the earth using custom software tools, material electronics, and physical simulation analogues.