Until you've seen this
http://www.nearlygood.com/video/amazingxmaslights.html Not sure what song, but I BELIEVE that's Manheim Steamroller music. (A Christmas group that's known for their laser light shows.) I believe they have a computer set up to route frequencies, triggering relays that activate the voltage outputs for the lights... not sure though, me and my dad are brainstorming to duplicate this in years to come. God this would be cool, especially pissing off your neighbors.