Nice combination...Chicago and Earth Wind and Fire have toured together in the past. I saw Chicago in Virginia Beach about four years ago, and they seemed to have lost a step. Of course, it was an outdoor venue, at the end of a long tour, so the band was probably tired and the acoustics were less than optimum. They will be back in the area in early September (with Earth, Wind and Fire) and I’ll definitely be in the audience.
I’ve seen em both separately in their heyday. If you want a treat, check out Chicago/EWF 25 or 6 to 4 on youtube.
Verdine White, EWF bass player owns the stage.