Everyone should go watch Sly Lives! - The Burden of Black Genius
Absolutely a must-watch doc, by Ahmir "Questlove" Thompson: https://en.wikipedia.org/wiki/Sly_Lives!_(aka_The_Burden_of_...
Oh I'd missed this. Will check it out thanks!
Also worth checking Questlove's other doc (which features among others Sly), Summer of Soul, if you haven't already