The tuning you've provided, named "cgbegb" in the source, transforms your Guitar into a deeply resonant soundscape. This tuning, which we'll call "Low C Major 7 Tuning", moves far from standard EADGBe, creating a rich harmonic foundation.

Verbal Analysis

As described, it's a "cool tuning" that can be used for "cool stuff," and indeed it is! This tuning offers a lush, full-bodied sound, leaning towards a dark yet warm character. The lowest string drops significantly to a C2, providing a powerful, resonant bass foundation. The subsequent open strings build a clear C Major 7 chord, which means strumming all open strings yields a beautiful, shimmering Cmaj7 voicing. This can evoke feelings of melancholy, introspection, or sophisticated warmth, making it ideal for fingerstyle, atmospheric compositions, or alternative rock where a unique harmonic texture is desired. The relaxed string tension from tuning down all strings will also make bends and vibrato feel very fluid, though string slap might be an issue with a light gauge.

Technical Analysis

The Low C Major 7 Tuning establishes the following open notes:

• String 6 (Low E): C2
• String 5 (A): G2
• String 4 (D): B2
• String 3 (G): E3
• String 2 (B): G3
• String 1 (High E): B3

When strummed open, these notes collectively form a C Major 7 chord (C-E-G-B), with the root (C), fifth (G), major seventh (B), and major third (E) distributed across the strings for a full, arpeggiated voicing. The intervals between the strings are: Perfect 5th (C-G), Major 3rd (G-B), Major 3rd (B-E), Perfect 4th (E-G), and Major 3rd (G-B). This arrangement makes open position barre chords highly effective. For example, a single barre across all strings at the 1st fret would yield a C#maj7, at the 2nd fret a Dmaj7, and so on. Other chord shapes, particularly those involving two or three strings, will also naturally align with the Cmaj7 tonality. Experimenting with inversions of Cmaj7, Gmaj, and Em will be very rewarding. Standard EADGBe chord shapes will not be directly transferable, requiring a fresh approach to the fretboard.

Tuning Notes

Each string is tuned as follows:

• String 6 (Low E): C2
• String 5 (A): G2
• String 4 (D): B2
• String 3 (G): E3
• String 2 (B): G3
• String 1 (High E): B3

How to Tune

To achieve the Low C Major 7 Tuning, you will need to adjust each string from standard EADGBe as follows. Please note: Most of these tunings involve significant drops of 3 semitones or more. For optimal playability and intonation, and to avoid excessively loose strings, it is highly recommended to use a heavier gauge set of strings designed for lower tunings. Tuning down more than 4 semitones, particularly on the High E string, can result in very low tension with standard strings.

• String 6 (Low E): To achieve C2, tune down 4 semitones from its standard E2 pitch.
  This is a substantial drop. A heavier gauge string is advised.
• String 5 (A): To achieve G2, tune down 2 semitones from its standard A2 pitch.
• String 4 (D): To achieve B2, tune down 3 semitones from its standard D3 pitch.
  This is a significant drop. A heavier gauge string is advised.
• String 3 (G): To achieve E3, tune down 3 semitones from its standard G3 pitch.
  This is a significant drop. A heavier gauge string is advised.
• String 2 (B): To achieve G3, tune down 4 semitones from its standard B3 pitch.
  This is a substantial drop. A heavier gauge string is advised.
• String 1 (High E): To achieve B3, tune down 5 semitones from its standard E4 pitch.
  This is a very significant drop. A heavier gauge string is strongly advised for this string to maintain tension and tone.