a drone tuned to the mains

The hum of a power line, played. A switch picks 50 or 60 Hz, and that frequency runs everything: PITCH walks up its harmonics, the transformer's buzz ripples at twice its rate, and the arcs crackle on its half-cycles. Every arc fires FLICKER, a gate made to be patched to a light, a video module or an envelope.

https://daylightnoise.com/hum/