I was listening to Sirius' 70's channel not too long ago and they played that song. I don't think I ever realized it was Bill Withers who is doing that version. I usually associate Bill Withers with the song Lean on Me more than anything. Anyhoo, I googled him and one of the first entries that came up was that youtube video. This live version actually blows away the studio version if you ask me.
That video is just dripping with 70's soul I'll tell ya.
We need some more of that stuff instead of the corporate, formulated, caca-music and hip hop that seems to permeate the current music scene.