It's a free download, and while at a concert on a free Wi-Fi network, the app will receive real-time information about the music and video during the show, and even give access to some of the samples being used. Outside of shows, the app says it will work as an "atmospheric location shifter," using the iPhone's microphone and headphones to wrap users "in a Plastikman environment." Whatever that means.
The point here is that this is an app actually built for a specific location, adding in specific funcationality when you're on a certain Wi-Fi network. That's a very cool idea. Even if you don't have Plastikman tickets (looks like he's only playing Coachella and one show in Detroit here in the US), the idea of location-specific software is one we'll probably see come up again in the future.