# Thumb Position, Double bass

The upper register, where the bass becomes a cello

Above fifth position, the Simandl system gives way to thumb position, the left thumb becomes a capo, and the fingerboard suddenly opens into a new register. This is where the bass solo repertoire lives.

Advanced · 6 lessons · approximately 144 minutes of material (not a mastery deadline).

## Before this module
- [Two Voices at Once](/learn/bass/two-voices), Double stops and chordal playing

## What this module covers
1. **Why Thumb Position Exists**, The physical logic of using the thumb as a movable nut in the upper register (24 min)
2. **Placing the Thumb**, Landing the thumb cleanly, in tune, with consistent tone production (24 min)
3. **Thumb Position in Half Thumb**, The first thumb position, geography, hand shape, and bow adjustment (24 min)
4. **Full Thumb Position**, Moving deeper into the upper register with full thumb technique (24 min)
5. **Shifting Within Thumb Position**, Moving between thumb positions smoothly without losing intonation (24 min)
6. **Fluency in the High Register**, Running passages and scales across multiple thumb positions (24 min)

## Practise with a free reference
- [Free metronome](/tools/metronome), Use a steady pulse while you count or repeat a short phrase.
- [Double bass tuner](/tools/tuner/bass), Check the open-string reference before comparing stopped notes.
- [Double bass first-position chart](/charts/bass), A lower-position reference only; it does not show every accidental, extension or shift in this module.
- [Public scale references](/learn/scales), Read pitch sequences and play reference examples. Available routines do not establish an exam syllabus requirement.

## What comes next
- [Reading at Sight](/learn/bass/reading-at-sight), Fluent score reading in bass, tenor, and treble clef

## Where should I start with thumb position?
The curriculum places Two Voices at Once before this module. Review those topics if they are unfamiliar. The first lesson is “Why Thumb Position Exists”: The physical logic of using the thumb as a movable nut in the upper register. The order is a study guide, not proof that every learner needs the same pace.

## How long is the thumb position module?
The 6 listed lessons total approximately 144 minutes of material. That estimate describes lesson content, not the practice time needed to become comfortable with the upper register, where the bass becomes a cello. Revisit one task at a time and use feedback from a teacher where physical technique is involved.

## What can I try here without an account?
The thumb position description, lesson sequence and prerequisite links are public. There is no full worked lesson sample for this module yet. The linked public tools and references are free. A free account includes the complete five-lesson foundation module in each instrument and five lessons in music theory, with saved progress and no expiry. Later lessons require the relevant paid package.

## Continue in Arco
The complete five-lesson foundation module in each instrument and five music theory lessons are free with an account, including saved progress and no time limit. Later lessons require the relevant paid package. Public samples do not assess your physical technique or certify exam readiness.

[See packages and pricing](/pricing) · [Back to the double bass curriculum](/learn/bass)

Canonical source: https://arcosounds.com/learn/bass/thumb-position