Do you have a favorite black group from back in the 60's?

I was listening to a documentary about a guy who was obsessed with Sly and the family stone, it was about him trying to track him down. He eventually organised a tribute night involving some members of the group. Apparently Sly turned up unannounced on a motorcycle. Then he left 5 mins later. The guy was both thrilled and mortified at the same time.