This 'Open Fm13' tuning creates a rich and complex minor tonality, as suggested by its name, with a distinctive 13th added for a sophisticated, jazzy flavor. The open strings, tuned to C2, F2, D4#, G4#, C4, D4, naturally form an F minor 13 chord (F - Ab - C - Eb - D), providing a full harmonic palette without any fretting. The low C2 and F2 strings establish a deep, resonant bass foundation, while the higher strings deliver bright, shimmering voicings that spread across a wide range. This makes it incredibly versatile for strumming, offering a lush minor 13th chord with a single open strum. The structure also lends itself beautifully to barre chords, allowing you to easily transpose this rich Fm13 voicing across the fretboard to achieve F#m13, Gm13, and other minor 13th chords. The unique intervals also open up possibilities for complex arpeggios and melodic phrases that highlight the inherent minor 13th quality.

How to Tune

• 6th String (Low E): Tune down 4 semitones to C2. (This is a significant drop; a heavier gauge string is advised to maintain tension and tone.)
• 5th String (A): Tune down 4 semitones to F2. (This is a significant drop; a heavier gauge string is advised to maintain tension and tone.)
• 4th String (D): Tune up 1 semitones to D4#.
• 3rd String (G): Tune up 1 semitones to G4#.
• 2nd String (B): Tune up 1 semitones to C4.
• 1st String (High E): Tune down 2 semitones to D4.

6th String: C2
5th String: F2
4th String: D4#
3rd String: G4#
2nd String: C4
1st String: D4