Verbal Analysis: This is an extraordinarily deep and wide-ranging 7-string guitar tuning, famously utilized by the progressive metal band Invent Animate for their track "The Sun Sleeps." It's engineered to deliver a monumental, guttural resonance, ideal for the intricate, heavy soundscapes found in modern progressive metal and djent. The tuning's construction, featuring numerous open perfect fifths and octaves, naturally facilitates the creation of powerful, sustained drone riffs and allows for complex, extended chord voicings that fully exploit the instrument's extended low end.

Technical Analysis:

• The tuning spans a vast range from a crushing low E1 (the lowest note on a standard 8-string guitar) to a bright B3, covering over two octaves of sonic territory.
• The bottom three strings (E1, B1, E2) form a powerful open E5 (Root-Fifth-Octave) power chord, providing an immediate and heavy foundation for impactful riffs and chugs.
• The addition of A2 on the 4th string allows for easy access to A-based harmonies or can act as a natural pivot point for chord progressions, creating a sense of tension or resolution against the low E.
• The upper strings (C#4, F#4, B3) present interesting harmonic possibilities. The F#4 and C#4 create an open C#5 power chord, perfect for higher-pitched, articulate riffs or melodic lines. When combined with B3, these three strings collectively outline a Bsus2 chord (B-C#-F#), offering bright, open voicings for arpeggios, leads, or shimmering ambient textures.
• While not a simple major or minor chord, strumming all open strings (E1 B1 E2 A2 C#4 F#4 B3) yields a rich, complex sonority that can be leveraged for ambient textures or dissonant accents. The presence of the low E and B, along with A, suggests a focus on E-centric or A-centric progressions that can lean into suspended or dominant qualities due to the upper register's intervals.

How to Tune:

Important Note: All string movements in this tuning involve tuning down by 5 semitones or more. Such significant drops can lead to very loose string tension with standard gauges. For optimal tone, proper intonation, and to prevent potential string breakage or damage to your instrument (especially the neck), it is highly recommended to use a heavier gauge string set specifically designed for extreme drop tunings when applying this setup.

• String 7 (Lowest): Tune to E1. This requires you to tune down 7 semitones.
• String 6: Tune to B1. This requires you to tune down 5 semitones.
• String 5: Tune to E2. This requires you to tune down 5 semitones.
• String 4: Tune to A2. This requires you to tune down 5 semitones.
• String 3: Tune to C#4. This requires you to tune down 6 semitones.
• String 2: Tune to F#4. This requires you to tune down 5 semitones.
• String 1 (Highest): Tune to B3. This requires you to tune down 5 semitones.

String 7 (Lowest): E1 - An incredibly deep E note, a full octave and a fifth below standard E2. This provides a massive, foundational rumble, pushing the boundaries of a 7-string into sub-bass territory, equivalent to the lowest string of many 8-string guitars.

String 6: B1 - A low B note, forming a perfect fifth above E1. This creates an immediate, thick E5 power chord when played with the 7th string, essential for heavy, rhythmic parts and driving riffs.

String 5: E2 - An E note, an octave above E1. This completes the robust open E5 power chord with Strings 7 and 6, reinforcing the massive low end and adding density to open chord voicings.

String 4: A2 - An A note, a perfect fourth above E2. This string introduces a new harmonic dimension, allowing for open A harmonies or providing a strong root for more complex chord structures, offering contrast to the deep E.

String 3: C#4 - A C-sharp note. This string, while still relatively low in the overall tuning, is higher in pitch than the previous strings. It introduces a major third interval in relation to A2, offering brightness or tension depending on the chord context.

String 2: F#4 - An F-sharp note, a perfect fourth above C#4. Played with String 3, this forms an open C#5 power chord, ideal for higher-pitched, articulate riffs or melodic motifs that cut through a dense mix.

String 1 (Highest): B3 - A B note. This is the highest voice in the tuning, completing a Bsus2 chord when played with C#4 and F#4. It provides clarity and chime for leads, melodic overlays, or shimmering arpeggios, adding a distinctly modern progressive touch.