It just makes it pleasant rather than jarring or off key (which is a HUGE difference). The shape == form follows function. It's a (tuned) metal bar across the

It just makes it pleasant rather than jarring or off key (which is a HUGE difference). The shape == form follows function. It's a (tuned) metal bar across the bottom that's struck by a hammer. It's supported by an elastic bungie so it's allowed to vibrate/hum after it's hit.