This unique and rich Open D#7M9 tuning for Guitar immediately establishes a sophisticated and resonant soundscape. As suggested by its name, this tuning forms a complete D# Major 7th chord with an added 9th (D#-G-A#-D-F) across its open strings, making it ideal for creating full, lush harmonies with minimal effort.

Technically, the open strings are tuned to D#3, A#3, D3, G3, A#4, and F4 (low to high). This arrangement provides a powerful D# root on the low string, followed by its perfect fifth (A#). The middle strings offer the critical Major 7th (D) and Major 3rd (G), which define the chord's quality. An octave higher A# (perfect fifth) on the second string and the Major 9th (F) on the first string complete the rich voicing. This creates a deep, resonant sound perfect for ambient textures, cinematic soundscapes, or expressive chordal work, much like the "Main Menu Theme" from Dark Souls it is associated with.

With all strings forming a D#maj9 chord, players can achieve impressive full-chord voicings by simply strumming open strings. This tuning is excellent for slide guitar, allowing smooth glides across complex harmonies. Barre chords become straightforward, as moving a single-finger barre up the fretboard will transpose the D#maj9 chord to other keys. Furthermore, the open nature of the tuning invites exploration of melodic lines and drone effects, while the internal intervals facilitate interesting arpeggios and interwoven melodies. Players can easily derive related chords such as D#maj7, D#add9, or even explore altered dominant or minor chords with slight fingerings.

The open notes for the Open D#7M9 tuning are as follows:

• String 6: D3# (Low E string tuned to D# in the 3rd octave)
• String 5: A3# (A string tuned to A# in the 3rd octave)
• String 4: D3 (D string kept at D in the 3rd octave)
• String 3: G3 (G string kept at G in the 3rd octave)
• String 2: A4# (B string tuned to A# in the 4th octave)
• String 1: F4 (High E string tuned to F in the 4th octave)

How to Tune to Open D#7M9:

Assuming a standard EADGBe tuning as your starting point:

• 6th String (Low E): Tune down 1 semitone from E to D#. The target note is D3#.
• 5th String (A): Tune up 1 semitone from A to A#. The target note is A3#. (Caution advised when tuning up to avoid string breakage.)
• 4th String (D): Keep as is; no change (0 semitones). The target note is D3.
• 3rd String (G): Keep as is; no change (0 semitones). The target note is G3.
• 2nd String (B): Tune down 1 semitone from B to A#. The target note is A4#.
• 1st String (High E): Tune up 1 semitone from E to F. The target note is F4. (Caution advised when tuning up to avoid string breakage.)

Note: All string movements are minimal (1 semitone up or down), so a change in string gauge is generally not required for this tuning. Always tune carefully and gradually.