Upward flowing water through a riser from a reservoir excites a freely suspended striker displacing it from its gravitational resting position to make chaotic contact with encircling resonating elements attached to a mounting plate in order to produce tones of random sequence and degree. The upward water flow is generated by a pump submerged in the water reservoir that is replenished by the gravity flow of water returning through an aperture in the mounting plate. The striker is freely suspended from a frame assembly including a means to raise or lower the striker in relation to the upward water flow, so that raising or lowering the striker decreases or increases respectively the production of tones or random sequence and degree. The preferred striker is spherical and the preferred resonating elements are chimes included in a housing forming a resonating chamber.