If my neighbor was blasting Gangnam Style to sync with his lights, I would be very angry indeed. It is cool to watch once though
It's not blasted, it's done through fm. You tune your radio to the station they set up.
All you see is lights blinking, you don't hear anything.
The lights aren't annoying, what's annoying is if the lights get popular and your street is too busy to get to you house in a reasonable amount of time. That's what happened to the dude that did wizards in winter for the beer commercial. His neighbors got fed up with the traffic and had him declared a public nuisance and that got him shut down.