I just picked up a couple of copies of Earth Wind and Fire. Sure reminds me of some good times. "Reasons" was a favorite prom song for awhile here. The other group I am reminded of is Heatwave. Remember "Always and Forever?"
I must say though that EWF was one band that led me into Jazz.
Maybe it's just me, but they still sound fresh today. Well, save for that "have mercy" thing.:D