WWW.AZCHORDS.COM | Ben Harper - Oppresion Bass | Ver. 1
This track doesn't actually have a bass line, but a mimic of the guitar riff sounds like this:
G|--------------------|----------------|
D|-3/5-5----3---3/5-5-|-3/5-5----------|
A|--------3---3-------|--------1-5--8--|
E|--------------------|----------------|