The B7sus4 tuning for a 4-string Guitar offers a distinctive and harmonically rich open voicing. This unique tuning immediately presents the notes of a B7sus4 chord across its open strings, making it an excellent choice for players looking to explore open harmony, create drones, or simplify complex chord voicings. The sound is full and resonant, laying a strong foundation for blues, jazz, progressive, or ambient music, or any style that benefits from open, ringing sonorities.

Technical Analysis

This 4-string guitar tuning sets the open strings to F#2, B1, E2, and A2, typically from the lowest-pitched physical string (String 4) to the highest-pitched physical string (String 1). Let's break down its components:

• Open Chord: The open strings collectively form a B7sus4 chord (B - E - F# - A). Specifically, the notes are ordered as F# (5th), B (Root), E (sus4), and A (b7) across the physical strings from low to high.
• Voicing: The specific open voicing from thickest to thinnest string is F#2 - B1 - E2 - A2. This creates a highly unusual inversion where String 3 (B1) is pitched lower than String 4 (F#2). This setup implies that 'String 3' would require a significantly heavier gauge string than 'String 4' to achieve proper tension and intonation on a conventional guitar, or it is intended for a non-standard instrument configuration.
• Chordal Possibilities: With an open B7sus4, various related chords become easily accessible. Simple barres across the neck will yield different inversions or voicings of B7sus4. Furthermore, by adding one or two fingers to the open B7sus4 shape, or moving basic major or minor triad shapes, players can quickly create rich harmonies. Chords like E minor, A major, G major, D major, and F# minor are within reach with relatively simple fingerings, leveraging the strong open chord foundation.
• Range: The tuning spans an interval from B1 to A2, covering just under two octaves, providing a compact yet full-sounding range for melodic and harmonic exploration.

How to Tune

This tuning is presented as a target state, with no specific adjustments from a previous tuning indicated by the 'string_movements' data. Therefore, to achieve the B7sus4 tuning, simply tune each string to its designated note:

• String 4 (Lowest Physical String): Tune to F#2. Keep as is; no change (0 semitones).
• String 3: Tune to B1. Keep as is; no change (0 semitones).
• String 2: Tune to E2. Keep as is; no change (0 semitones).
• String 1 (Highest Physical String): Tune to A2. Keep as is; no change (0 semitones).

As all strings are noted as 'Keep as is; no change (0 semitones)', this tuning describes the absolute pitches to aim for rather than relative adjustments from a standard tuning. Ensure your instrument's setup (especially string gauges) can comfortably accommodate the target pitches, particularly the unusually low B1 on 'String 3' compared to F#2 on 'String 4', which might necessitate a custom string set.

String 4: Tuned to F#2. This is the 5th of the B7sus4 chord and serves as the lowest note in this specific voicing, assuming a standard physical string order from thickest to thinnest.

String 3: Tuned to B1. This is the root of the B7sus4 chord. Notably, it is pitched lower than String 4, suggesting a very heavy gauge string or an unusual instrument configuration.

String 2: Tuned to E2. This represents the sus4 (suspended fourth) of the B7sus4 chord, providing a characteristic open and unresolved quality.

String 1: Tuned to A2. This is the flattened seventh (b7) of the B7sus4 chord, completing the dominant seventh harmony.