Tick Tock Trebuchet is the prototype for the 'Ballad of the Paddled Ore' but instead of having a piano at the base it has two wire strings that sound as the pendulum strokes them. The beaten copper wings are blown by the wind or a person to produce the movement which activates the sound.
Link to the video: https://vimeo.com/107493378
Two stones screwed to the base for weighting the pendulum
Enclosing the strings
Checking the movement of the pendulum
The top added
The beaten copper wings