David Edward Hughes' Harp

Origin
David Edward Hughes became an inventor at an early age, creating a printing press and improved microphone. During his experiments, Hughes observed speaking in one device could be heard in a separate portable microphone apparatus he had set up. It is commonly thought that he hear upon electromagnetic radiation, otherwise known as radio waves, almost a decade before the discovery of the electromagnetic spectrum.

Effects
Playing the harp will transmit radio waves off of the strings. Each note produces a different frequency, which requires great mastery to replicate. Although not explicitly dangerous, it can still provide destructive interference with radio enabled devices.