this is the acoustic bassy sort of part though it sounds like it might be on guitar,
be wrong though
e----------------------------------|
B----------------------------------|
G----------------------------------|
D----------------------------------|
A---------555457-----------555457--|
E--55--55-----------55--55---------|
[ Tab from: http://www.guitaretab.com/s/stephen-marley/233406.html ]
and the chords are just A & D
A D
e---5-----5-----5-----5------------|
B---5-----5-----7-----7------------|
G---6-----6-----7-----7------------|
D---7-----7-----7-----7------------|
A----------------------------------|
E----------------------------------|
"Don't gain the world and lose your soul,
Wisdom is better than silver and gold."