“A player sitting at the Telharmonium’s master console with its touch-sensitive keyboards could trigger the device’s network of whirling rotors, generating electrical currents that corresponded to the notes being played. The currents were sent through telephone wires to “broadcast” the music to hotels, restaurants, and private homes as a subscription service. The sound quality was limited because amplification and electrically driven dynamic loudspeakers hadn’t been invented yet. The Telharmonium’s music was piped through what were essentially telephone receivers acoustically boosted with large megaphone horns—some as long as six feet—or channeled through carbon arc lamps that could oscillate with the electronic signal.”