I luv me some old school Stevie. I enjoy his more recent cuts too, but there was something so raw about his early stuff. The imperfect delivery displayed in this 1969 performance is more common to music pre-90s, I think, but it is in no way deficient or less than more polished, modern music. In a way, this is more honest, certainly more natural, and more easily accessible to the heart and the spirit.
Sherrod Story – Here lies your book boyfriend…naked.
American romance novelist of paranormal, erotic, contemporary and young adult/new adult fiction
Sherrod Story - Here lies your book boyfriend...naked. 
This is one my absolute favorites by Stevie Wonder. Wholeheartedly agree with your assessment about the depth, raw power of the lyrics, the music and the performance.