Seriously. My first album was Chicago Live at Carnegie Hall. I had no idea how incredible and unusual that was. I was in 7th grade and bought it for five dollars from my friend's sister, who had played Side One and didn't like it. Can you imagine? I picked up Chicago V and then Chicago VI when it came out (it was the new one), then went back to I, II, and III. As a fledgling musician, it was truly mind-blowing. The arrangements, the improvisation, the horns, the vocals, the songs themselves.
Ten years later, they were singing "soft hits" written by David Foster and Diane Warren. Yeah, it was over.