How awesome! I cannot imagine how much time and money goes into that type of display. I also hope they turn them off at night. I can imagine it'd be very tough to sleep with all of that flashing going on.
One of the houses in our neighborhood has their lights like that. When you walk by you can hear the music (but you can't hear it if you're driving by) it's rather nifty. But I'm glad I don't live across the street!