It’s about time the world had a new musical instrument that anyone could play (even the Stylophone was too hard for many of us).
Today’s invention is a wooden box (an old guitar body or even a cigar box, if you must). To this is attached an eccentric weight and a motor to rotate it. The motor is controlled by an external, rotary switch so that the frequency of the resulting vibration is variable.
In this way, a loud guitar-like noise can be made using only a single dial (rather than having to cope with all the usual plucking, pecking and bowing).