They're playing my tune

摘要

Joe pompei bends down and picks up his favourite toy. It's a thin black disc about half a metre across which he holds in two hands like a barber's mirror. He flicks a switch on an ordinary-looking amplifier, and you become vaguely aware of a tinny beat, as though there's someone on the other side of the room listening to salsa music on leaky headphones. Then he swings the disc towards you, until you're facing it full on, and something extraordinary happens. The air around your head explodes with music.