Wagner - Ride of the Valkyries - Played In Lasers (MIDI Laser Piano) 

The Laser Piano is a machine I've built that fires 88 lasers in time with any MIDI song played through it. There is one laser for each individual note. See the video linked below to see how it works:
• MIDI Controlled Laser ...
More details and behind the scenes pictures can be found on my science blog here - halflife390scie...