This is how I play the bass line for Ba55, from switchfoot's new album, Fading West. I 
play it on guitar, but you can easily change it over to bass, where it's supposed to be played.

E --------------------------------------------------|
B --------------------------------------------------|
G --------------------------------------------------|
D ------5----8-5---10-5-8----5----8-5---10-5-8------|
A -------3--------------------3---------------------|
E --3--------------------3--------------------3-----|

Wash, rinse, and repeat as necessary.