Eddie Senay was a funk guitarist who gigged around Detroit in the 1970s and put out two now very-much-sought-after LPs on the Sussex label, "Hot Thang" and "Step By Step."
Most of the tracks from these two albums turned up on an obscure Spanish CD called "Soul Preachin'", which may have been a bootleg. In any case, "Ain't No Sunshine" comes from "Hot Thang."
The MP3 is taken from a 45 single, so expect some surface noise.