Heimdall Guild

So far D-CIL and Kinien are the only ones that I know of that played the Dark Carnival campaign of L4D2 so far, but you basically get rescued from a concert location that was featuring the Midnight Riders. Valve has put up a website for the 'band'. Read this and check the link for the full details. It's amusing. I guess there's speculation that some DLC will feature the band as playable characters.