Intervalic Bass Lines
The "intervalic" bass line is created from your knowledge of what notes make particular chords. The rules are very simple:
1. Start the bass line on the root of the chord
2. Play one chord tone per beat until the last beat of the measure or chord
3. On the last beat, play a passing tone to the root of the next chord
Let's begin the examples with a basic 2-5-1 chord that you mastered in Lesson 1.

Walking Bass Lines
Next, here is an example of F blues with an intervalic style bass line

Scales and Bass Lines
The next kind of bass line is a "scale" style bass line. The rules are very similar to the intervalic style, however it is your knowledge of how scales interact with chords instead of actual chord notes that build the bass line.
1. Start on the root of the chord
2. Play a note of the scale that is related to the chord or tonality of the chords you are dealing with until the last beat of the chord
3. On the last beat of the chord, play a passing tone to the root of the next chord
The first example is another 2-5-1 chord.

The next example is F blues with a mix of Scale and Interval style bass lines. A good blend of both styles of walking bass lines is what you would normally play in jazz. There are two choruses in the midi file for this one. The second chorus is not printed out, but you can listen to it and hear some of the principles of walking a bass line.

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