What is Open G tuning?

Open G tuning changes the strings to D-G-D-G-B-D (low to high). Strumming all strings open produces a G major chord. Barring any fret gives you a major chord at that position, which is ideal for slide guitar.

What scales work in Open G tuning?

The G major pentatonic and G blues scale are natural fits. For slide playing, the major scale patterns align perfectly with the open tuning. The Mixolydian mode also works beautifully for a bluesy feel.

Why do slide guitarists use Open G?

Open G makes slide guitar much more intuitive. Since barring across all strings at any fret produces a major chord, you can play melodies and chords simply by moving the slide up and down the neck. This is why it's been the standard tuning for blues slide guitar.

A# Altered Guitar Scale

Guitar scale in Open G tuning — fretboard diagram

Tuning

Frets

A# Altered in Open G — Notes and Intervals

The A# Altered scale is the ultimate dominant scale in jazz. On Guitar, its notes are A#, B, B##, D, E, F#, G#. It contains every possible altered tension, making it sound extremely dissonant and complex. It is used by professional improvisers to create maximum tension over a dominant chord before a satisfying resolution. Commonly used in Jazz, Fusion, Post-Bop, Contemporary. Notable players include John Coltrane, Michael Brecker, Pat Metheny, Chick Corea. Use over 7alt, 7#9, 7b9, 7#5, 7b5 chords. The definitive scale for altered dominant chords that resolve to minor. Play C Altered over C7alt resolving to Fm.

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

Intervals: 1P, 2m, 2A, 3M, 4A, 6m, 7m

Degrees: 1 b2 #3 4 #5 b6 b7

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

Number of notes: 7

Tuning: Open G (D-G-D-G-B-D)

Also known as: super locrian, diminished whole tone, pomeroy

About Open G Tuning

Open G tuning (D-G-D-G-B-D) produces a G major chord when strummed open, making it the definitive tuning for slide guitar and delta blues. The tuning's natural consonance means that barring across any fret gives you a major chord, which is why it's been the backbone of blues and roots music for over a century.

From Robert Johnson to Keith Richards, Open G has shaped some of the most iconic music ever recorded. Keith Richards famously removes the low 6th string entirely in this tuning, creating his signature five-string sound on songs like 'Start Me Up' and 'Brown Sugar'. For slide players, Open G is essential — it allows clean, singing slide lines across all strings with minimal effort.

BluesSlide GuitarRockCountryFolkRoots

Notable artists: Keith Richards, Robert Johnson, Ry Cooder, Joni Mitchell, The Black Crowes

Best for: Slide guitar, delta blues, Keith Richards-style rock riffs, and open-string fingerpicking

Musical Character

DissonantComplexTenseResolving

Contains every possible altered tension (b9, #9, b5, #5) over a dominant chord. It is the ultimate 'tension before resolution' scale — play it on V7 and resolve to I for maximum drama.

Explore This Scale in Other Tunings

← All Guitar scales in Open G tuning