Sonny Boy Williamson Harmonica Bass Line
Hey, this is Tomlin from Tomlin Harmonica Lessons—and this week we’re digging into a Sonny Boy Williamson harmonica bass line from the tune Mighty Long Time.
Now, here’s the fun bit—on the original track, this bass line isn’t played on harmonica… or even bass guitar. It’s sung. That’s right—someone’s literally singing the bass part, kind of like a “doot-doot” line. But I thought it would be a brilliant exercise to translate it onto harmonica—and it works beautifully.
You’ll need a C harmonica, and we’ll be playing in second position, which puts us in the key of G.
If you’re already working on your improvising, this bass line will give you a whole new way to explore the 12-bar blues. And if you’re new to improvisation, my Improvisation for Beginners lesson pairs really nicely with this.
Click here to download resources
The Full Bass Line Structure
Good news—it’s super straightforward. Once you’ve got the rhythm and note pattern down for one chord, you can apply it to all three chords in the 12-bar blues.
Also—there’s no turnaround on this one. It’s just a repeating pattern the whole way through. The key is locking in that swing feel. Don’t rush—keep it lazy and laid-back. That’s where the groove lives.
The 1 Chord Bass Line
Let’s start with the 1 chord—G in this case.
Play:
2 draw → 3 draw → 4 draw → 3 draw → 4 draw
All the action is on the beat and the off-beats—so make sure it’s swinging, not robotic. I like to loop it like a proper bass line. Here’s what it sounds like:
play-along audio suggestion here
Take your time—loop it slowly until the rhythm settles in.
The 4 Chord Bass Line
Now we move to the 4 chord—C. It’s the same rhythm, but we’re switching to blow notes:
1 blow → 2 blow → 3 blow → 2 blow → 3 blow
Now—I know some of you know I’m not usually a fan of the 3 blow… but in this context, it’s totally fine. What you’re really doing is shifting to first position to follow the 4 chord properly. That change makes musical sense.
Don’t stress if that’s a bit confusing right now—just learn the pattern. It sounds great either way.
The 5 Chord Bass Line
This is the trickiest of the bunch—but also the most useful one to get under your fingers. Here’s the pattern:
1 draw → 2 draw (half-step bend) → 3 draw (whole-step bend) → 2 draw (half-step bend) → 3 draw (whole-step bend)
Take it slow. Those bends can be slippery, especially if you’re new to them. Try isolating just the 2 and 3 draw bends first if they’re giving you trouble.
Once it feels solid, you can start looping it like the other lines.
Practice Tip: Start With the Last Four Bars
Most people always start at bar one of the 12-bar blues—which means they practice the 1 chord bass line a ton, but hardly touch the 5 chord.
Here’s a better idea—start with the last four bars. That way, you’re working backwards:
5 chord
4 chord
1 chord
You’ll get more reps on the harder material—and it’ll feel more balanced when you play the full thing.
What You’ve Actually Learned: Chord Arpeggios
So here’s a cool thing—this isn’t just a bass line. It’s also a chord arpeggio.
Each of these licks outlines the core notes of a major chord:
root, third, fifth
2 draw → 3 draw → 4 draw = G major arpeggio
1 blow → 2 blow → 3 blow = C major arpeggio
1 draw → 2 draw bend → 3 draw bend = D major arpeggio
That means you’re not just copying a bass part—you’re learning the harmonic skeleton of the blues. This is really helpful for improvising.
Using Arpeggios for Better Improvisation
Here’s how you can apply this.
Maybe you’re already improvising using just root notes:
2 draw for the 1 chord
1 blow or 4 blow for the 4 chord
1 draw or 4 draw for the 5 chord
That works—but now you’ve got three target notes for each chord, not just one. So instead of jumping around to chase different holes, you can stay in a tighter area and make more musical choices.
Here’s a quick example:
Over the 1 chord: stick with 2 draw and 3 draw
Over the 4 chord: go to 2 blow or 3 blow
Over the 5 chord: try that 2 draw half-step bend
play quick example audio here if desired
It’s more subtle, more expressive—and way more fun.
Lick 1
Lick 2
Lick 3
Wrap-Up and Practice Resources
This Sonny Boy-style bass line is a brilliant tool for learning groove, building technique, and developing your musical instincts.
And best of all—you can grab the tab and slow audio clips totally free. Just click the link, pop in your email, and I’ll send it your way.
Call to Action
If this clicked for you—try building a solo using just those arpeggio notes. Keep it simple. Keep it musical.
If you’re ready for more creative blues improv, check out my Improvisation for Beginners lesson next.
Happy harping!
