I was fortunate to see Sly and the Family Stone twice (in 1969 and again in 1970 or 1971). They were amazing both times. They even made the hockey rink built in to the Spectrum in Philadelphia vibrate. To me, the live shows were even better than the records. The records don’t capture the energy and volume. Try the footage from Woodstock for an idea. By the second show, they could just play extended versions of hit songs for an entire concert. The opening act was Little Sister, which included Sly’s sister, that had two hits.
This has the poster for the 1971 show I saw at the bottom of the page
Sad! 