1979: Allman Bothers Concert in the Kettle Moraine.

The stretch of interstate flowing south to the Illinois-Wisconsin border had officially turned into a parking lot.

Most of the cars had their trunk lids open and the tailgates of several pickup trucks were down. People sat drinking beer and smoking pot and cigarettes. Lawn chairs and coolers were scattered about the pavement between the cars and trucks, while other people walked back and forth along the highway, snaking around the vehicles on the frozen interstate. It was very similar to the tailgate party that ushered in the concert at Alpine Valley earlier that afternoon. Excerpt from the book: Pay To Play