The Grammy Award–winning bandleader for The Roots spoke with Fresh Air's Terry Gross about his film on the funk musician who led Sly & the Family Stone in the 1960s and '70s.

there's a fear of winning, because if you're too successful then you're singled ... up the baton of what should have happened to Sly. Then, 10 years later, in 1982, Michael himself will go through ...