Tab: *

Riff 1:
-------------------------
-------------------------
-------------------------
-5-5-5-5-----5-5-5-5-----

Riff 2:
-------------------------
-------------------------
---5-5-5-------5-5-5-----
-5-----------5-----------

Riff 3:
-------------------------
-------------------------
-7-----------------------
---5-5-5-----5-5-5-5-----

Riff 2 (again)

Riff 3 (again)

Riff 2 (again)

Then:

Riff 4:
-------------------------
-------------------------
-7-----------7-----------
---5-5-5-------5-5-5-----

Riff 5:
-------------------------
-------------------------
---7-7-7-----7-----------
-7-------------5-5-5-----

Then repeat this pattern throughout the song.

Very easy and simple reggae bassline, but it sounds hypnotic when played 
with a band.