Need help identifying song

I've heard this song plenty of times, but I can never remember the lyrics or find out the name or artist. It sounds reggae/Jamaican from what I can tell, and is a bit slow. Can somebody listen to the melody and help me?

c''4 a'4 c''4. b'8 g'4 e'4 b'4. a'8 c''4 a'4 c''4 f'4 f''4 e''4 d''4 c''4

It's something along the lines of this:

Middle-C down to A back to C down to B down to G down to E back up to B down to A up to C down to A up to C down to F up to F down to E down to D down to C.

All about the same, slow tempo.

If somebody has Sibelius, I can post a file here with the melody.