I first heard this song on a reggae compilation that received serious rotation during my college days. It's not my favorite track on the comp, but it does have an interesting etymology. There are the references to Eric Donaldson's "Cherry Oh Baby" (which also appears on the aforementioned comp, and which has its own interesting origin as the winning entry in the 1971 Jamaican Festival Song Contest [Incidentally, I admire Mr. Donaldson's mugshot.]).
But I'm more interested in the guitar part that opens the song. It's borrowed from an American soul song from the early '70s. So you get a 2-for-1 today -- I'll post the latter sometime this afternoon. No cheating.