What Is Cross-Note Tuning? A Deep Dive into the Blues Guitarist’s Secret Weapon

Cross-note tuning is a guitar open tuning where the strings are tuned to a minor chord, typically by lowering the third string a half step from a major open tuning. This creates a somber, resonant sound ideal for slide guitar and blues, allowing full minor chords with a single finger or slide.

Etymology / Origin

The term “cross-note” likely derives from the act of “crossing” the third string’s pitch down a semitone, transforming a major open chord into a minor one. This tuning emerged in the early 20th century among African-American blues musicians in the Mississippi Delta. Players like Robert Johnson and Son House adopted it to achieve a haunting, vocal-like quality with a slide. The tuning is also known as “open minor tuning” or “bottleneck tuning,” reflecting its close association with slide guitar techniques.

How It Works

In cross-note tuning, the guitar’s open strings form a minor chord. For example, open D minor (D–A–D–F–A–D) lowers the third string from F# (as in open D major) to F, creating a D minor triad. The intervals between strings are: perfect fourth (D–A), perfect fourth (A–D), minor third (D–F), major third (F–A), and perfect fourth (A–D). This arrangement allows a slide or a single finger to barre all strings at any fret to produce a minor chord. To play a major chord, the player frets the third string one fret higher, raising the minor third to a major third. The tuning also produces rich sympathetic resonances and droning overtones, enhancing the expressive power of slide melodies.

Notation & Diagrams

Below is a text representation of open D minor cross-note tuning, with string numbers and notes:

e (1st) – D (tune down from E)
B (2nd) – A (unchanged)
G (3rd) – F (tune down from G)
D (4th) – D (unchanged)
A (5th) – A (unchanged)
E (6th) – D (tune down from E)

Chord diagram: The open strings sound a D minor chord. To play a G minor, barre all strings at the 5th fret. To play an A minor, barre at the 7th fret. For a major chord, such as G major, barre at the 5th fret and fret the 3rd string at the 6th fret.

Step-by-Step / How to Play

1. Begin with your guitar in standard tuning (E–A–D–G–B–E).
2. Lower the 6th string (low E) down a whole step to D. Use a tuner to match the pitch of the open 4th string (D) an octave lower.
3. Lower the 1st string (high E) down a whole step to D, matching the 4th string’s D an octave higher.
4. Lower the 3rd string (G) down a whole step to F. Check against the 4th string’s D: the interval should be a minor third.
5. Strum all open strings; you should hear a D minor chord. Fine-tune as needed.
6. Place a slide (glass or metal) on your ring or pinky finger. Lightly touch the strings directly above the fret wire and move the slide to change pitch. Use your other fingers to dampen strings behind the slide for a clean tone.

Common Variations

Cross-note tuning can be applied to different root notes, each offering a unique tonal character:

• Open E minor: E–B–E–G–B–E. Popularized by Robert Johnson; brighter and tighter than D minor.
• Open A minor: E–A–E–A–C–E. Often used for folk and Celtic music.
• Open G minor: D–G–D–G–Bb–D. A lower, darker variant favored by some modern slide players.
• Cross-note C: C–G–C–Eb–G–C. Less common but used for deep, resonant blues.

Regional variants: Delta blues musicians frequently used open D minor and open E minor, while Texas blues players sometimes adopted open A minor. A capo can be used to transpose these tunings without retuning.

Common Mistakes

• Over-tightening strings: When tuning up to open E minor from standard, the 3rd string (G to G#) and others may be under increased tension. Use lighter gauge strings to avoid breakage.
• Neglecting string gauge: Heavier strings are often preferred for slide, but drastic tuning changes can cause intonation issues. Experiment with string sets designed for open tunings.
• Poor muting technique: Unwanted string noise is common. Use the palm of your picking hand and the fingers behind the slide to mute strings not being played.
• Confusing major and minor positions: Remember that the open chord is minor; to play a major chord, raise the third string by one fret. Practice switching between them.
• Inaccurate slide placement: The slide must be directly over the fret, not between frets, for correct intonation. Use a light touch and vibrato for expression.

Notable Examples in Songs

• “Cross Road Blues” – Robert Johnson
• “Death Letter” – Son House
• “Little Red Rooster” – Howlin’ Wolf
• “Come On in My Kitchen” – Robert Johnson
• “Walking Blues” – Robert Johnson
• “Dust My Broom” – Elmore James