For a breakdown of the Dorian mode and how to learn and use it, check out this lesson:
For more on modes:
Scroll down to hear the modes in action on the original songs.
8 Bass Lines That Use The Dorian Mode
Moondance, Van Morrison (John Klingberg)
Stick It Out, Rush (Geddy Lee)
Good Times, Chic (Bernard Edwards)
Dance Dance Dance, Chic (Bernard Edwards)
If You Have To Ask, Red Hot Chili Peppers (Flea)
Blood Sugar Sex Magik, Red Hot Chili Peppers (Flea)
So What, Miles Davis (Paul Chambers)
I have a lesson for this one here.