Good question. I'm not good at music classification, but it was good ass-kicking electronica dance music. The DJ was a white male wearing a red and black outfit and I think he was around 5 1/2 feet tall. (geez, that sounds like a police description)
I searched flickr, and found a photo that is near the dome i think:
I think the dome extending off to the right had a band setup inside and DJ equipment. So if anyone knows who was at the camp near Electroshock Therapy, that might be a big clue.