Mastering Piedmont Alternating Bass & Open Tunings

The Rhythmic Architecture of the Piedmont Blues

Unlike the heavy, drone-centric delta blues characterized by a relentless monotone thumb beat on the low sixth string (the classic "dead thumb" style of Charley Patton and Bukka White), Piedmont acoustic blues was born out of ragtime piano traditions. Originating across the southeastern seaboard and migrating up the river valleys into the Appalachian foothills and the Ohio River basin, Piedmont guitarists transformed the six-string acoustic guitar into a complete miniature orchestra.

The right-hand thumb acts as the pianist's left hand, executing an unyielding alternating bass ("stride") between the root and fifth of each chord on beats 1, 2, 3, and 4. Meanwhile, the index and middle fingers act as the pianist's right hand, plucking syncopated melodic phrases, grace notes, and treble pinches on the off-beats. This rhythmic polyphony creates an infectious, dancing bounce that defines the style.

Open Tunings: Mechanics, Intervals & Resonator Resonance

While Piedmont players frequently worked in standard concert tuning (keys of C, G, E, and A), open tunings unlocked deep modal harmonies and allowed seamless integration of bottleneck slide licks:

1. Vestopol Open D (D-A-D-F♯-A-D)

Tuned from low to high: D2 (root), A2 (5th), D3 (octave root), F♯3 (major 3rd), A3 (5th), D4 (octave root). By dropping strings 1, 2, and 6 down one full step, total longitudinal string tension drops by nearly 20% compared to standard tuning (as calculated on our Open-Tuning Resonator String Calculator). This drop in tension allows players to install heavier gauge strings (.013 or .015 slide sets) without straining the guitar neck or collapsing a delicate spun-aluminum biscuit cone.

In Vestopol, the thumb commands an immense, resonant bass octave between strings 6 and 4. The major third on the 3rd string provides rich, sweet gospel cadences popularized by Mississippi John Hurt and Blind Willie Johnson.

2. Spanish Open G (D-G-D-G-B-D)

Tuned low to high: D2 (5th), G2 (root), D3 (5th), G3 (octave root), B3 (major 3rd), D4 (5th). Dropping strings 1, 5, and 6 gives a high-register singing tone. The 5th string becomes the fundamental tonic bass root, allowing rolling syncopated thumb patterns between strings 5, 4, and 6. Blind Blake and Tampa Red utilized Spanish tuning to produce blistering ragtime rolls and melodic slide lines behind singing vocals.

Archival ASCII Tablatures: Core Fingerstyle Patterns

The following four exercises represent standard pedagogical transcriptions preserved in the Pomeroy Archive reading room. Practice with a metronome, maintaining an unswerving thumb beat while the treble fingers float freely across syncopated subdivisions.

Tablature 1: Mississippi John Hurt Style Travis-Piedmont Roll in Open D

Notice the steady alternating thumb jumping between the low D (string 6) and middle D (string 4), with index-finger pinches on the upbeat of beats 2 and 4.

Tuning: Vestopol Open D (D - A - D - F# - A - D)
Key: D Major | Tempo: 92 BPM | Thumb = T, Index = i, Middle = m

      1   &   2   &   3   &   4   &     1   &   2   &   3   &   4   &
D  |----------0---------------0-------|-------0-------2---0-----------|
A  |--------------0---------------0---|-----------------------0-------|
F# |------0---------------0-----------|---0-------0---------------0---|
D  |----------0---------------0-------|-------0---------------0-------|
A  |----------------------------------|-------------------------------|
D  |--0---------------0---------------|---0---------------0-----------|
      T   i   T   m   T   i   T   m       i   T   m   i   m   T   i
  

Tablature 2: Blind Blake Ragtime Roll with Thumb-Stumble Stride in Open G

This pattern mimics Blind Blake's legendary "thumb-stumble" ragtime stride. The thumb delays slightly on the second beat, creating an infectious syncopated stumble against the 3rd-string roll.

Tuning: Spanish Open G (D - G - D - G - B - D)
Key: G Major | Tempo: 112 BPM | Swing 8ths

      1   &   2   &   3   &   4   &     1   &   2   &   3   &   4   &
D  |----------0---------------0-------|---3p0---------0---------------|
B  |--------------1p0-------------0---|-------1-----------1p0---------|
G  |------0---------------0-----------|-----------0---------------0---|
D  |----------0---------------0-------|-------0---------------0-------|
G  |--0-------------------------------|---0---------------------------|
D  |------------------0---------------|-------------------0-----------|
      T   i   T   m   T   i   T   m       m   i   T   m   i   T   i
  

Tablature 3: Etta Baker Two-Finger Piedmont Melodic Pinch in Open G

Etta Baker of Morganton, North Carolina, played with only her thumb and index finger. Her clean, dancing melodies combined simultaneous "pinches" where thumb and index strike together, followed by an immediate trailing index brush.

Tuning: Spanish Open G (D - G - D - G - B - D)
Key: G Major | Tempo: 104 BPM | Thumb & Index only

      1   &   2   &   3   &   4   &     1   &   2   &   3   &   4   &
D  |--5-------0-------3-------0-------|--/5---3---0-------------------|
B  |--5-------0-------3-------0-------|---------------1p0-------------|
G  |------0---------------0-----------|-------------------0-------0---|
D  |----------0---------------0-------|-------0---------------0-------|
G  |--0---------------0---------------|---0---------------0-----------|
D  |----------------------------------|-------------------------------|
     [T+i] i  T       [T+i] i T          [T+i] i  i   i   i   T   i
  

Tablature 4: Monotone "Dead Thumb" Drone with Slide Licks in Open D

In contrast to alternating bass, this delta-style pattern anchors the low D string on every single downbeat (1, 2, 3, 4) with zero variation, while a glass or brass bottleneck slide slides into the 3rd, 5th, and 12th frets.

Tuning: Vestopol Open D (D - A - D - F# - A - D)
Key: D Modal Minor/Major | Bottleneck Slide on Pinky

      1   &   2   &   3   &   4   &     1   &   2   &   3   &   4   &
D  |------------------/12-------------|--/3---/5---3---0--------------|
A  |----------/12-------------0-------|--------------------0----------|
F# |------------------------------0---|------------------------0------|
D  |----------------------------------|-------------------------------|
A  |----------------------------------|-------------------------------|
D  |--0-------0-------0-------0-------|---0-------0--------0-------0--|
      T   *   T  [sl] T  [sl] T   i       T  [sl][sl] i    i   T   i
  

Tension & Gauge Recommendations for Open Tunings

When switching between standard tuning and open tunings, the tension on your instrument's neck and resonator cone changes dramatically. The table below outlines typical tensions for a 25.0" scale resonator guitar using medium phosphor bronze strings (.013–.056):

To calculate exact tensions for heavier slide gauges (.015–.059) or 25.5" scale Dobros, visit our Interactive Resonator Tension Calculator on the homepage. To learn how to cut biscuit saddle slots to accommodate slide action without string buzz, read our Biscuit & Spider Cone Setup Manual.