This is the Charlie Hunter Hybrid Tuning (6-String Version), specifically derived from the top six strings of his unique 7-string setup. It transforms a standard guitar into a deeply resonant instrument capable of rich, complex harmonies, ideal for jazz, funk, and groove-oriented playing.

Verbal Analysis

The tuning offers an exceptionally low and wide sonic palette, starting with a deep C2 on the lowest string. This creates a powerful, almost bass-like foundation. The sequence of C-F-C-F on the bottom four strings provides a strong, resonant harmonic bedrock, particularly suggestive of F major or C suspended harmonies. The higher strings, Bb4 (A#4) and D4, introduce tension and color, elevating the overall sound to a sophisticated, jazzy character. The large interval between the 3rd and 2nd strings (F3 to A#4) is a striking feature, enabling open voicings that would be impossible in standard tuning, facilitating expansive chord melodies and a unique approach to lead lines.

Technical Analysis

The open string notes are C2 F2 C3 F3 A#4 D4. Analyzing the intervals from the lowest string (String 6 to String 1):

• String 6 (C2) to String 5 (F2): Perfect 4th (+5 semitones)
• String 5 (F2) to String 4 (C3): Perfect 5th (+7 semitones)
• String 4 (C3) to String 3 (F3): Perfect 4th (+5 semitones)
• String 3 (F3) to String 2 (A#4): Minor 7th plus Octave (+17 semitones) - This is a very wide interval, indicating a specific purpose for melodic range.
• String 2 (A#4) to String 1 (D4): Perfect 4th down (-5 semitones) or Diminished 5th up (+6 semitones) - This is also a unique interval, contributing to the distinct voicing.

When strummed open, the notes C, F, C, F, A#, D (C2 F2 C3 F3 A#4 D4) combine to form a rich C minor 7th suspended 4th with an added 9th (C-F-Bb-D). This intricate chord makes the tuning highly suitable for modern jazz and fusion, allowing for complex harmonic textures with minimal effort. Alternatively, it can be viewed as a Bb major triad (Bb-D-F) over a C root, with the added F and C creating a complex Bbmaj9/C voicing. The low C and F provide a strong pedal tone capability, and the unique upper intervals allow for fresh melodic possibilities and chord voicings.

Chords and Playability

The open tuning itself presents a sophisticated Cmin7sus4(add9) chord, offering immediate harmonic depth. The repeating C-F-C-F pattern on the lower strings allows for easy formation of F-based power chords or C suspended chords by barring across these strings. The vast interval between the 3rd and 2nd strings means that standard chord shapes will need significant adjustment, but it also opens up opportunities for unique two-note voicings and wide stretches. This tuning encourages a creative approach to chord construction, often focusing on partial chords or finger-picked arpeggios that highlight the unusual intervals. Players can explore bass-line driven melodies on the lower strings while simultaneously playing chord fragments or melodic embellishments on the higher strings, akin to a bass and guitar combination. The deep low end makes it excellent for rhythm sections, providing a full sound usually requiring multiple instruments.

How to Tune Your Guitar

This tuning involves specific adjustments from standard EADGBe tuning. Follow these steps for each string:

• String 6 (Low E string): Tune to C2. Tune down 4 semitones.
• String 5 (A string): Tune to F2. Tune down 4 semitones.
• String 4 (D string): Tune to C3. Tune down 2 semitones.
• String 3 (G string): Tune to F3. Tune down 2 semitones.
• String 2 (B string): Tune to A#4. Tune down 1 semitone.
• String 1 (High E string): Tune to D4. Tune down 2 semitones.

Based on the provided string movements, all strings are tuned downwards from standard EADGBe. Take care with your string tension when tuning to ensure safety and optimal playability.