I love all this stuff. I am a huge Motown fan. Add Earth Wind and Fire and The Commodores to the list (maybe they should be 70s, but I'm throwing them in anyway).
I saw EWF two years ago co-headline with Chicago, and it was an awesome show. It was only overshadowed by Michael Jackson passing two days later, so I didn't really get to soak in the experience. I need to see EWF again!