A witnessed speculation of events which have transpired, based on first-hand experiences with said contraption, all true.
It is an incredibly small object; a white, capsule-shaped wand that fits into the palm of the hand, capable of wondrous, beautiful and (for some, perhaps) horrible things. A sigil on the face of the wand controls the magic from mortal flesh to its false ivory internal workings...the small, blinking lights would frighten the ignorant, but the sounds would astonish or humble.
Attached to it is a flexible tether. This must be the transit line by which the magic is channeled, perhaps via the elves who carry the musical notes from one place (the Machine-ling) to another (the mortal's impressionable brain). I never imagined such magic to be possible in so tiny an environment.
The sounds emanate from a tether from a sort of tiny beacon. I see people everywhere with it injected into their heads. They act as if it is a natural consequence of being a human.