Verbal Analysis:

The 'Resonant Deep Fourths' tuning plunges your 7-string guitar into a realm of profound depth and rich harmonic textures. Starting with an extraordinarily low G1, this tuning lays a massive foundation, moving up through two perfect fifths (G1-D2-A2) before transitioning into a consistent series of four perfect fourths (A2-D3-G3-C4-F4). This unique combination offers a compelling sonic landscape, blending the powerful, open resonance of low fifths with the articulate and harmonically versatile nature of fourths tuning.

Musically, this tuning is a powerhouse for genres demanding immense weight and clarity. Think progressive metal, doom, djent, or experimental soundscapes where colossal, sustained chords and intricate, low-end riffs are paramount. The wide interval between the lowest strings provides an expansive tonal palette, while the subsequent all-fourths arrangement makes for consistent fretboard navigation, offering familiar chord shapes and scales for the higher strings. It encourages open, ringing harmonies and allows for easily accessible power chords on the lower register.

Open Chords and Possibilities:

With all strings open, this tuning presents a complex harmony centered around G. The open strings G1 D2 A2 D3 G3 C4 F4 can form interesting harmonic structures:

• An open Gsus2/4 chord (G-D-A-D-G-C-F) with a rich, extended voicing. The root (G), fifth (D), and ninth/second (A) are prominently featured, while the C (fourth) and F (minor seventh) add tension and color.
• Power chords are incredibly accessible across the lower strings. For instance, a simple two-finger shape on strings 7 and 6 (G and D) or 6 and 5 (D and A) provides immense low-end power.
• The top four strings (D3-G3-C4-F4) are tuned in perfect fourths, similar to a bass guitar. This allows for easy transposition of common chord shapes and scales, making complex jazz voicings or rapid single-note runs more intuitive on these strings.
• Barre chords can be easily formed across the top four or five strings, producing predictable and consistent harmonic results.

Technical Analysis:

This is a 7-string Guitar tuning with the following notes, from lowest (7th) to highest (1st) string:

• 7th String: G1 (Lowest note, incredibly deep)
• 6th String: D2
• 5th String: A2
• 4th String: D3
• 3rd String: G3
• 2nd String: C4
• 1st String: F4 (Highest note)

Interval Analysis (from lower to higher string):

• String 7 (G1) to String 6 (D2): Perfect 5th
• String 6 (D2) to String 5 (A2): Perfect 5th
• String 5 (A2) to String 4 (D3): Perfect 4th
• String 4 (D3) to String 3 (G3): Perfect 4th
• String 3 (G3) to String 2 (C4): Perfect 4th
• String 2 (C4) to String 1 (F4): Perfect 4th

Compared to a standard 7-string tuning (typically B1 E2 A2 D3 G3 B3 E4), this tuning represents a radical departure. The 7th string is tuned significantly lower than even a standard low B, resulting in an exceptionally deep and resonant G1. The 6th string, D2, mimics a 'Drop D' configuration relative to a standard E string. The middle strings (5th, 4th, 3rd) retain their standard pitch relative to A, D, and G in a common 6-string setup, while the 2nd and 1st strings are tuned up a semitone to C and F respectively.

This tuning is designed for maximum low-end impact and consistent fingering on the upper strings. However, the extreme drop on the 7th string (from B1 to G1, a full 4 semitones down) necessitates careful consideration of string gauge. A much heavier gauge string is strongly advised for the 7th string to maintain adequate tension and intonation, and to prevent floppiness. Similarly, the 6th string (E to D) will also benefit from a slightly heavier gauge. The higher strings require less attention to gauge for the minimal semitone increase.

How to Tune:

Please note: Extreme changes in string tension (tuning down more than 4 semitones or up more than 4 semitones) may require a different string gauge to maintain playability and prevent damage to your instrument. Tuning up more than 3-4 semitones can also risk string breakage or neck damage. The movements below are relative to a standard 7-string tuning (B1 E2 A2 D3 G3 B3 E4).

• 7th String (Lowest): Tune down 4 semitones from B1 to G1. (Note: This is a significant drop; a heavier gauge string is highly recommended.)
• 6th String: Tune down 2 semitones from E2 to D2. (Note: Similar to a 'Drop D' modification.)
• 5th String: Keep as is; no change (0 semitones) from A2.
• 4th String: Keep as is; no change (0 semitones) from D3.
• 3rd String: Keep as is; no change (0 semitones) from G3.
• 2nd String: Tune up 1 semitone from B3 to C4.
• 1st String (Highest): Tune up 1 semitone from E4 to F4.