A Harmonized Bass Line is a great way to create a groove moving comp that clearly reflects the harmony and has a lot of movement. In this video I am going to show you how I play a harmonized bass line on a Bb Blues, and also go over the shell voicings and spread triads that you need to create your own.
Playing Harmonized bass lines is often associated with Jim Hall, especially from his comping of Bill Evans, and it is a great way of comping to have in your vocabulary. It works especially well if you are comping in a duo setting since it is really full and also lays down a solid groove.
Building a chord vocabulary
Before I start breaking down the harmonized bassline example I think it makes sense to just do a few exercises to build a chord vocabulart.
When you play harmonized bass lines then most of the time it is going to be with 3 note voicings and most of those are either Shell voicings or open voiced triads.
Shell voicings with the chord on the D and G strings are found in two variations. One with the root on the 6th string and one with the root on the 5th string.
Since this is a Bb blues I have chosen to use the scale that goes with a Bb7, namely Eb major for these exercises.
This first example is with the root on the 6th string
And the same exercise with the root on the 5th string.
Another common voicing is the open-voiced or spread triad. This way of playing triads adds larger intervals to the structure. In this case it makes them sit well in the voice-leading when they are mixed with shell-voicings.
Harmonized Bass Line on a Blues
In this part of the lesson I will analyze the Harmonized bass line example.
The first bar is a very simple and common way to walk up on a dominant. The first chord is a Bb7 shell-voicing which is followed by a series of 1st inversion spread triads. This takes us up to the IV chord Eb7.
The second bar is another standard solution. I play Eb7 on beats 1 and 3 and a leading chord for Eb7 on beat 2, in this case a D7. On beat 4 I have a B7 as a leading chord to the Bb7 in the next bar. This happens again in bar 5, 6 and 10.
Having a leading chord on beat 4 is very common and nice way to create a natural flow.
Bar 3 is a bassline that is in fact harmonizing the Bb major triad and adding a leading chord on beat 4. This also happens in bar 7.
Bar 4 is also a very common solution to a quic II V progression. The basic chords, Fm7 and Bb7 are found on beats 1 and 3. On beat 2 I use a B7 to lead to Bb7 and beat 4 is an E7 to lead to Eb7. This same solution is used in bar 8 and bar 12. The progression in bar 11 is not a II V but the approach with leading chords is the same.
The Cm7 bar is using a diatonic walk up, so the Cm7 is part of a II V I in Bb major and the bass line walks up the scale with Cm7, Dm7 and Ebmaj7 shell voicings. The E7 on beat 4 is there as a leading chord for F7.
How to get Harmonized Bass lines into your playing
Working with this approach you should check out some of the ways I move between chords. Maybe make some variations on the Bb blues and then try to construct your own harmonized bass lines on a song or standard that you already know well.
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Harmonized Bass Line on a Blues
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