The disco of the present moment is a gigantic set of transductions. A record needle (magnetic cartridge) converts mechanical vibrations from vinyl into an electrical signal. A loudspeaker converts this electrical signal into sound waves. The piezoelectric effect transduces mechanical pressure into high voltage electrical energy, a jet of electrons. This jet of information is amplified further by butane, resulting in a flame. Electrons flow through a wire. A fluorescent bulb converts their energy into light. An electromagnetic wave propagates through space. An antenna focuses the wave and converts it into electrical signals. A transducer converts one kind of energy into another kind of energy.