Below are a list of free lessons you may try out before you buy.
By request, here is an old Joe Jackson song with some interesting harmony.
In this lesson, I will show you how to start creating bass lines using fundamental chords. Keep it simple using the first , third and fifth degrees of the major and minor scales.
In this lesson, I will teach you the classic bass line from The Joker by Steve Miller. This uses the simple progression I, IV, V, IV.