The Doors — "Riders on the Storm"
     L.A. Woman — Track 10
Standard tuning (E,A,D,G)
  Tabbed by Aj

    / — slide

Intro / Riff 1(00:14)
G|———————————————————
D|——2————————————————
A|————2———2———0—4—0——
E|——————3———0————————

Riff 2
G|———————————————————
D|———————————————————
A|————2———2———0—4—0—— repeat (main riff of song)
E|——0———3———0————————

Riff 3
G|———————————————————————————
D|———————————————————————————
A|——00——/1212——1010——1212——
E|———————————————————————————

Riff 2x2

Riff 4
G|——————————————————————
D|——12—12—12—12——10—10——
A|——————————————————————
E|——————————————————————

thats the basic order of the entire song.
there are veriations of riff 3 such as:
A|——00——/1212——00——/1212——

A|——00——/1212——10h12——1212——

Listen to the song; they aren't difficult to pick out, and any variation really sounds 
just as good.

Great bass line especially for how simple it is.