What is Open C tuning?

Open C tuning is C-G-C-G-C-E (low to high). Strumming all strings produces a C major chord. The low C string sits two whole steps below standard E, giving exceptional bass depth.

What scales work in Open C?

C major and C major pentatonic are the most natural choices. C Lydian adds a dreamy, cinematic quality. For heavier styles, C minor and C Phrygian deliver dark intensity.

Do I need heavier strings for Open C?

Yes, the low C string needs a heavier gauge to maintain proper tension — at least a .056 or .058 for the 6th string. A set of 12-56 or similar is recommended. Without heavier strings, the low C will sound muddy and floppy.

C# Mystery #1 Guitar Scale

Guitar scale in Open C tuning — fretboard diagram

Tuning

Frets

C# Mystery #1 in Open C — Notes and Intervals

The C# Mystery #1 scale is a rare and experimental synthetic scale found in modern music theory. On Guitar, its notes are C#, D, F, G, A, B. It is typically associated with generative music and computer-aided composition where traditional rules of melody and harmony are intentionally broken. Commonly used in Experimental, Computer Music, Avant-Garde. Used in experimental, non-functional contexts. A compositional curiosity for exploring unconventional melodic paths.

Notes: C#, D, F, G, A, B

Intervals: 1P, 2m, 3M, 5d, 6m, 7m

Degrees: 1 b2 3 4 b5 b6

Formula: H-WH-W-W-W-W

Number of notes: 6

Tuning: Open C (C-G-C-G-C-E)

About Open C Tuning

Open C tuning (C-G-C-G-C-E) produces a C major chord when strummed open, with an enormous bass depth from the low C string (two whole steps below standard E). The tuning spans a vast tonal range that gives compositions an almost orchestral scope, making it a favorite for both delicate fingerstyle and crushing heavy music.

John Butler's 'Ocean' — one of the most famous modern fingerstyle compositions — is performed in Open C, showcasing the tuning's incredible dynamic range from thundering bass to shimmering harmonics. Devin Townsend uses Open C extensively across his catalog for its massive, wall-of-sound potential. Jimmy Page used it on Led Zeppelin's 'Friends' from Led Zeppelin III. Soundgarden also explored Open C. The three C strings and two G strings create powerful octave resonances that make even simple chord shapes sound huge.

Fingerstyle AcousticProgressive Rock/MetalPost-RockFolkExperimental

Notable artists: John Butler, Devin Townsend, Jimmy Page (Led Zeppelin), Soundgarden, William Ackerman

Best for: Cinematic fingerstyle compositions, progressive metal walls of sound, post-rock textures, and any music that needs enormous tonal range from deep bass to bright treble

Musical Character

AbstractGenerativeExperimentalUnknown

A rare synthetic scale from modern music theory, associated with generative and computer-aided composition where traditional rules are intentionally broken.

Explore This Scale in Other Tunings

← All Guitar scales in Open C tuning