It's like the theremin of the 21st century: behold, the beamz Music Performance System:
Breaking the laser beams with your hands automatically generates pre-authored pulses, streams, riffs or loops of musical notes or sounds from a variety of instruments — all kinds of strings, keyboards, winds, percussion. Sophisticated high-fidelity sounds seem to pour off your fingertips like
magic!
http://www.sharperimage.com/us/en/catalog/product/sku__BZ100 - via GeekAlerts