Just google "sound activated led lights". There's tons of hardwired solutions for something like that. Getting existing LEDs to work with one of those units could be a tad tricky, though. It might be easier to just use the lights that come with whatever sound activated unit you buy.
But if you're looking for something that can be computer controlled (to do custom animations, work with Mame, etc), you'll need something like an LEDWiz, and some software, like LED Blinky. CHeck out the Wiki here for info on that.