Should you use your thumb to fret bass notes? Some teachers say no. I say: if it sounds good and you can do it, go for it.
The truth is, we’re all built differently. Some of us have longer fingers than others. Jimi Hendrix could wrap his whole hand around the fretboard and play chords any which way he wanted. The rest of us have to work with what we’ve got.
The “While My Guitar Gently Weeps” Progression
One of the best examples of this technique is the famous chord progression from “While My Guitar Gently Weeps” by The Beatles. It uses a descending bass line over an A minor chord shape.
Here’s how it works:
Start with a regular open A minor. That’s your baseline. Then walk the bass down: G on the sixth string (I use my pinky for this one), then F# with my thumb wrapped around, then F with the thumb again.
When to Wrap Your Thumb
To get your thumb on the sixth string, you have to adjust your hand position. Bring your wrist up a little more and let your thumb curl over the top of the neck.
It’s not the “textbook” position they teach in classical guitar. But for certain chord voicings—especially open chord variations with walking bass lines—it’s actually faster and easier.
My rule: if you have really long fingers and it comes naturally, use your thumb. If your hands are smaller and it’s a struggle, find another fingering that works. There’s always more than one way to play something.
A Note About Slash Chords
These are all slash chords. The note after the slash tells you which bass note to play:
- Am/G = A minor chord with G in the bass
- Am/F# = A minor chord with F# in the bass
- Am/F = A minor chord with F in the bass (this is also technically an Fmaj7)
Here’s a fun bit of theory: when you play Am/F, you’re also playing an F major 7th chord. The notes line up: F, A, C, E. Same thing, different name, depending on how you look at it.
The Ear Comes First
Don’t let anybody tell you using your thumb is “wrong.” Your thumb is part of your hand. Any part of your hand is workable as long as the notes ring clear.
If it sounds good, it’s not wrong. There’s a reason it sounds good, and somewhere there’s a piece of theory that explains why it works. The ear was the decision to write the theory out—not the other way around.
For more ways to add movement to your open chords, check out the other lessons in this series: alternating bass lines and chord embellishments are great next steps.
Visit our main Guitar Chords section for more lessons.